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08-12-2011, 11:51 PM
| | | | Tuning head repair
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I have some vintage tuners from a mid 70's Yamaha bass which need to be repaired.
They have a barrel on the shaft of the head which can have the tension adjusted, but one of them keeps slipping so the string will detune as you play.
Anyone know of a resource to fix? |
08-13-2011, 12:22 AM
| | Registered User | | Join Date: Apr 2007 Location: Finland (Northern Europe) | | | Hi.
Could You post a pic, that would help a lot.
Regards
Sam |
08-13-2011, 12:29 AM
| | | | Just attached, you can kind of see them below the peg.
Last edited by thelimey : 08-13-2011 at 06:45 PM.
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08-13-2011, 08:23 AM
|  | <---Shinola Shite--^ | | Join Date: Dec 2010 Location: Manitoba, Canada | | | We need to see the back of the tuners "the business" part. Which part are you saying is tensioned? Are they open geared?
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08-13-2011, 08:41 AM
| | Registered User | | Join Date: Jul 2009 Location: Willmar, Minnesota | | | How are you putting the string on? It looks like you just wrapped it around.
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08-13-2011, 08:53 AM
| | <---Shinola Shite--^ | | Join Date: Dec 2010 Location: Manitoba, Canada | | | NO DOUBT! Good eyes I never saw that! If that's the case, no wonder! I was trying to figure this out. It is nearly mechanically impossible for a spur gear to slip against a worm gear. OP needs new string if there's not enough length left to do it properly.
Limey, you need a 90 degree bend in the end of the string and insert it into the hole in the bottom of the slot on each barrel center, up and out, bend around barrel, then wind around barrel.
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Last edited by 96tbird : 08-13-2011 at 09:00 AM.
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08-13-2011, 01:27 PM
|  | Registered User | | Join Date: Jul 2004 Location: Fort Collins, Colorado | | | Yup. Strings improperly installed - fortunately, it's easy to fix.
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08-13-2011, 01:31 PM
|  | Gold Supporting Member with a bad case of GAS
Born Again Tubey | | Join Date: Dec 2009 Location: Stuck in traffic -NY & CT | | Quote:
Originally Posted by 96tbird  NO DOUBT! Good eyes I never saw that! If that's the case, no wonder! I was trying to figure this out. It is nearly mechanically impossible for a spur gear to slip against a worm gear. OP needs new string if there's not enough length left to do it properly.
Limey, you need a 90 degree bend in the end of the string and insert it into the hole in the bottom of the slot on each barrel center, up and out, bend around barrel, then wind around barrel. | also put a little fish hook at the end so it grabs the sides even better. Go to fodera website. they have a section on changing strings. helpful....
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08-13-2011, 01:32 PM
| | Gold Supporting Member with a bad case of GAS
Born Again Tubey | | Join Date: Dec 2009 Location: Stuck in traffic -NY & CT | | |
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08-13-2011, 05:06 PM
| | | | No it's not to do with the way the string are on.
The part that is slipping is circled in the picture, there is a small opening where you can put a tool or allen wrench into to tention the mechasnism, but it no longer works.
I think these were common in Yamaha bass and guitars in the 70's.
Last edited by thelimey : 08-13-2011 at 06:45 PM.
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08-13-2011, 05:14 PM
| | Registered User | | Join Date: Apr 2010 Location: Windsor, Ontario | | | So the tuning keys screw onto the mechanism and its not all one piece, and when you turn the keys to wind the strings the key is just slipping and not actually winding?
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08-13-2011, 05:39 PM
| | | | I think what you outline is correct in terms of how it is connectd.
When I play the mechanism shakes loose and the string detunes. When I got the bass I cranked down on it hard but it still comes loose after a while |
08-13-2011, 05:40 PM
| | <---Shinola Shite--^ | | Join Date: Dec 2010 Location: Manitoba, Canada | | | so an allen key goes into that little hole and its stripped?
EDIT I was posting when you posted the last. I get it, the allen screw is on a tube loosens off you tighten it against the shaft that goes through the tube
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Last edited by 96tbird : 08-13-2011 at 05:44 PM.
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08-13-2011, 06:09 PM
| | | | Correct, now I wan't to see it I can get it fixed. |
08-13-2011, 06:12 PM
| | | Quote:
Originally Posted by thelimey I think what you outline is correct in terms of how it is connectd.
When I play the mechanism shakes loose and the string detunes. When I got the bass I cranked down on it hard but it still comes loose after a while | so you tighten up that collar and it's OK, but then the collar loosens and the key begins to get loose?
try tightening it up again to where the tension feels right, then running a drop of loc-tite in there to freeze it in place.
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08-13-2011, 06:23 PM
| | <---Shinola Shite--^ | | Join Date: Dec 2010 Location: Manitoba, Canada | | | Yup, My bet is there WAS a nylon tube up in there that's shot in the spot where that screw contacts it. Otherwise that allen screw would be grinding on the metal shaft. I would pull the spur gear and try to get that thing apart. That tube doesn't appear to be part of the"pillow block". Can you wiggle that tube? Turn it? If there is a nylon tube up in there, I would flip it around for another 40 years good service. Conjecture of course. Try and disassemble that baby.
Wish you could video it cranking on it. If that allen is shot, you can get some at a hobby site I visit, looks to be 2mm, maybe 1.5
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'74ish Ampeg V4B, 115/210. * '75 Gibson G3. *Epi Tbird. *Squier: VM Jazz, CV 50's P. *Squier VM Jazz Assoc. *MBC 641. Squier owners club
Last edited by 96tbird : 08-13-2011 at 06:29 PM.
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08-13-2011, 06:46 PM
| | | | I took it apart as much as I could and the collar has a thread at the bottom which goes into the base plate of the tuning key. When you loosen it the tuning head shaft can be removed.
Sadly this is getting out my field of expertise hence who I was looking for help :-) |
08-13-2011, 07:48 PM
| | <---Shinola Shite--^ | | Join Date: Dec 2010 Location: Manitoba, Canada | | OK I see that the BUTTON, the part you hold on to turn, has an allen screw. If you can get that button off, the tube will come off when the allen is loosened or removed. A this point if you don't want to go further, find a machinist (or a handy neighbor with lots of tools) to disassemble the shaft and remove the allen and put a new one in (and or retap for a new one). You may need to order a new allen screw if he doesn't have short metric sizes. PM me and I can help you find it once you figure out what you are going to do next.
With a little effort this looks repairable. Yamaha has a nifty little design going on there! Great pics BTW. 
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'74ish Ampeg V4B, 115/210. * '75 Gibson G3. *Epi Tbird. *Squier: VM Jazz, CV 50's P. *Squier VM Jazz Assoc. *MBC 641. Squier owners club
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