62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

For help with setups and other technical issues.
Post Reply
User avatar
smurphy28
PAT PEND
PAT PEND
Posts: 2
Joined: Fri Nov 06, 2020 8:26 pm

62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by smurphy28 » Fri Nov 06, 2020 9:48 pm

Hello!

I just recently purchased a used AVRI 62 Jazzmaster from 2003. While trying to set it up a bit better I went to adjust the truss rod a take a bit of relief out of the neck and it won't tighten at all. It will loosen but is maxed on.

Did I buy a guitar with a warped neck? Am I screwed or can my tech fix this? Problem is he's backed up at least a few weeks which is why I'm trying to sort it out myself.

Any advice?

User avatar
seenoevil II
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 403
Joined: Tue Nov 19, 2019 12:59 pm

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by seenoevil II » Fri Nov 06, 2020 10:05 pm

Loads of options. What you're willing to try yourself? That's another story.

First of all, make sure the rod works at all. Loosen it and see if the neck responds, or while it's off the body, see if it bows back without string tension. Then back it off just to feel the nut turn and make the nut isn't just binding on the threads.

Something to try is backing the rod off and giving it a firm tug backwards. Maybe over your knee. This is hard maple, you can't hurt it with jazz buff's skinny arms. The rod might be hung up on some old squeeze out or friction with the woodb inside the channel. This might free it up and also just convince the neck to move some. Then re tighted the the rod and repeat, checking the relief as you go.

The most straight forward approach is spacers. Back the truss nut all the way out and place an appropriate sized washer around the threaded rod being sure but to mar the threads. You might not have such washers on hand.

Then you can bust out the clamps. Clamp to a padded straight surface with maybe a shim at one or both ends to give a back bow and leave for a day. If no progress, set it up again and use a hair dryer to gently heat the maple (heat gun is likely too hot and might ruin the finish or delaminated the fingerboard).


These have worked for me, but on an AVRI, I'd let a pro try them. Just remember this is hard maple you're dealing with. You have to show it who's boss. But use controlled force. If you hear cracking, stop.
Last edited by seenoevil II on Fri Nov 06, 2020 10:17 pm, edited 4 times in total.

User avatar
schoolie
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 782
Joined: Fri Feb 26, 2010 4:25 pm
Location: Portland, OR

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by schoolie » Fri Nov 06, 2020 10:09 pm

That's a common problem. You can buy truss rod washers to get more tension on the neck.https://guitarpartsresource.com/hardware_trussnuts.htm

User avatar
timtam
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 1807
Joined: Sun Oct 22, 2017 2:42 am
Location: Melbourne

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by timtam » Fri Nov 06, 2020 10:16 pm

This is the spacer/washer approach to get some adjustment range back on your truss rod ....
Image
Washers ..
https://www.ebay.com/itm/Genuine-Fender ... 3213503785

User avatar
smurphy28
PAT PEND
PAT PEND
Posts: 2
Joined: Fri Nov 06, 2020 8:26 pm

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by smurphy28 » Fri Nov 06, 2020 10:47 pm

seenoevil II wrote:
Fri Nov 06, 2020 10:05 pm
Loads of options. What you're willing to try yourself? That's another story.

First of all, make sure the rod works at all. Loosen it and see if the neck responds, or while it's off the body, see if it bows back without string tension. Then back it off just to feel the nut turn and make the nut isn't just binding on the threads.

Something to try is backing the rod off and giving it a firm tug backwards. Maybe over your knee. This is hard maple, you can't hurt it with jazz buff's skinny arms. The rod might be hung up on some old squeeze out or friction with the woodb inside the channel. This might free it up and also just convince the neck to move some. Then re tighted the the rod and repeat, checking the relief as you go.

The most straight forward approach is spacers. Back the truss nut all the way out and place an appropriate sized washer around the threaded rod being sure but to mar the threads. You might not have such washers on hand.

Then you can bust out the clamps. Clamp to a padded straight surface with maybe a shim at one or both ends to give a back bow and leave for a day. If no progress, set it up again and use a hair dryer to gently heat the maple (heat gun is likely too hot and might ruin the finish or delaminated the fingerboard).


These have worked for me, but on an AVRI, I'd let a pro try them. Just remember this is hard maple you're dealing with. You have to show it who's boss. But use controlled force. If you hear cracking, stop.
Great advice - thanks! Maybe I let a pro deal with it. I'm sure this isn't the first time he's seen this. I'm glad it sounds like it might be fixable though.

User avatar
Francer
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 428
Joined: Mon Sep 14, 2015 10:11 am
Location: Uk

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by Francer » Sat Nov 14, 2020 8:50 am

I’ve bought two AVRI necks in the last couple of years and they both have this problem, I suspect it’s a design flaw on this model, there’s a few more reports around the web for the AVRI line if look for them.

Washers are your best first bet, you might be lucky (I wasn’t) and I’m not sure any of the ‘bending’ options will result in a permanent fix if at all, if the truss rod is maxed out, physically bending to add more back bow means the truss rod will not be contributing to the neck stability at all since it can’t contract on it’s own (I guess it may have some elasticity to take up the slack), and over time, with string tension the neck will return to it’s old bend until it contacts the rod again.

One small suggestion, don’t just tighten the nut to add backbow, help it out by removing the neck and placing fretboard down on two piles of books (or cushions or whatever) one at each end, and then push down on the centre of the neck to take the tension off the rod, and then tighten the nut, you might get a little extra backbow this way.

This guy massively over eggs the pudding with his crazy rig, but this is the idea https://youtu.be/dHLoYcHUovc

User avatar
PJazzmaster
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 5013
Joined: Tue Mar 10, 2009 6:59 am
Location: Bo Diddley Technical Institute of Cryptozoology (European HQ)

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by PJazzmaster » Sat Nov 14, 2020 9:50 am

Francer wrote:
Sat Nov 14, 2020 8:50 am
I’ve bought two AVRI necks in the last couple of years and they both have this problem, I suspect it’s a design flaw on this model, there’s a few more reports around the web for the AVRI line if look for them.
↑ ↑↑ this. Not unlikely, but not on all AVRI necks. My AVRI JM had the same issue. I play with rather high action so I was able to cope with it for a very long time. But somehow the backbow got worse and worse over time. After about 10 years I changed the neck , I found a used AVRI JM neck on eBay. I got it for a good price since it had a partial refret (the first 5 frets) - a-not-so-good job - definitely not done by a pro but actually good enough (and the old neck was in desperate need for a refret anyway). And surprise surprise: the replacement neck is simply awesome, the guitar plays better than it ever did, seriously.

but also try what others are suggesting !!! especially that:
timtam wrote:
Fri Nov 06, 2020 10:16 pm
This is the spacer/washer approach to get some adjustment range back on your truss rod ....
Image
Washers ..
https://www.ebay.com/itm/Genuine-Fender ... 3213503785

User avatar
Francer
PAT. # 2.972.923
PAT. # 2.972.923
Posts: 428
Joined: Mon Sep 14, 2015 10:11 am
Location: Uk

Re: 62 AVRI Jazzmaster Truss Rod Won't Tighten Any Further

Post by Francer » Sat Nov 14, 2020 10:47 am

They are lovely necks to be fair, mine is a nice slim profile with a lovely dark board. I just decided to live with it and I don’t really think about it anymore, it’s not too bowed and seems stable for now, fingers crossed.

Post Reply