[CAUT] Aluminum hammer rail (Screw hole) repair

[David Ilvedson]

Seems to me Yamaha would have a good solution...



David Ilvedson, RPT

Pacifica, CA 94044









Original message

From: "Mark Cramer" 

To: "College and University Technicians" 

Received: 6/27/2007 9:33:35 AM

Subject: Re: [CAUT] Aluminum hammer rail (Screw hole) repair





How timely Barbara and Jim, I'm just traveling a new set of S/F's on a 1976 C-7 and found a stripped hole in the bass.

  

Can you suggest a place to look for this kit... auto supplies, etc? Does it have a parts number, or go by the thread size?

  

Otherwise, I seem to recall someone suggesting there was a nominal upsize thread (imperial or metric?) that could be used.

  

thanks,

Mark Cramer

Brandon University

  

PS The alignment groove in the aftermarket parts I'm using doesn't quite line up with the wire Yamaha recesses into their action rails. This pulls the flange away from the lip that the flanges butt against, making it difficult to get a nice alignment.

  

Fortunately, there's a recess in that lip, and I was ABEL to thread a peice of #16 music wire between and the flange. Now I'm left with about a .25mm gap between the lip and the flange, but at least it's precise.

  

     



-----Original Message-----

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org]On Behalf Of Barbara Richmond

Sent: Wednesday, June 27, 2007 10:34 AM

To: College and University Technicians

Subject: Re: [CAUT] Aluminum hammer rail (Screw hole) repair





Hi Jim,

  

I bought the Recoil kit, but it has no screws in it.  What screws did you use?  

  

John Dewey also mentioned this repair in his class, Action Frame Diagnosis and Repair, so, if it is OK with you, I will also list him on the submission since I am putting together a special "TT&T goes to the convention."

  

Thanks,

  

Barbara

----- Original Message ----- 

From: Jim Busby 

To: College and University Technicians 

Sent: Thursday, January 25, 2007 3:58 PM

Subject: [CAUT] Aluminum hammer rail (Screw hole) repair

  



List,



Here’s a way to repair stripped screw holes (Especially if an oversized screw strips) in an aluminum rail that takes less than a minute or two. “Helicoils” is what they are called. (See attached pic.) 



You drill out the hole and tap it, then insert the little coil which disappears into the tapped threads, and then you’re good to go! Maybe this has been shown on CAUT before, I don’t remember seeing it. The new screw is actually a machine screw with fine threads so it takes a few more rotations, but this is way better than anything else I’ve ever tried. The package shows a bolt, but what actually goes in has a Phillips head and looks like a normal screw.



Jim Busby RPT

BYU
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