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PostPosted: Wed Nov 24, 2021 1:09 am 
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Cocobolo
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Joined: Tue Jan 15, 2013 10:00 pm
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First name: Josh
Focus: Build
Status: Amateur
I’ve got an acoustic guitar in where the owner wanted the ancient screw-on strap button at the tail replaced with a regular tapered end pin. Seemed straight forward. Within the first 30 degrees counter-clockwise rotation to remove the existing screw it snapped off just below the surface. Upon inspection it was pretty badly corroded. Not sure there would have been any way to get it out in one piece?

I’ve used brass tubing with teeth filed in to remove tiny tuner mounting screws. Has anyone ever had success using this technique on larger screws? I’m going to need to go down at least 3/4” to get what’s left of this one out. And possibly 3/16” or a bit wider diameter.

Open to other ideas also. If I can keep the hole edges clean I should be able to still ream for an end pin and have it all end up looking neat.


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PostPosted: Wed Nov 24, 2021 4:37 am 
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Cocobolo
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First name: Josh
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I suppose I could drill a piece of scrap steel as a guide, clamp it in place to stop the bit wandering and try to just drill the screw out with a regular bit. Worried about collateral damage though.


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PostPosted: Wed Nov 24, 2021 6:15 am 
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Cocobolo
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Joined: Fri Mar 15, 2013 5:31 am
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First name: Bob
Last Name: Orr
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Yes you can use the same method but might need to use something a bit tougher than brass, say mild steel tubing. Someone does a set of these extractors, but I cannot remeber who!
Here is a Youtube demo. Drill a hole the same size as the tube in a block of wood and clamp in place as a guide. https://www.youtube.com/watch?v=Q6h5uLmjUN8
Cheers, Bob



These users thanked the author Bob Orr for the post: joshnothing (Wed Nov 24, 2021 6:29 am)
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PostPosted: Wed Nov 24, 2021 8:42 am 
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Joined: Sun Mar 06, 2011 12:04 am
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First name: Chris
Last Name: Pile
City: Wichita
State: Kansas
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Quote:
I suppose I could drill a piece of scrap steel as a guide, clamp it in place to stop the bit wandering and try to just drill the screw out with a regular bit. Worried about collateral damage though.


This idea will not work, Josh. Drill bits tend to follow the easier and softest path.

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These users thanked the author Chris Pile for the post: joshnothing (Wed Nov 24, 2021 3:01 pm)
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PostPosted: Wed Nov 24, 2021 3:06 pm 
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Cocobolo
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Joined: Tue Jan 15, 2013 10:00 pm
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First name: Josh
Focus: Build
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Thanks for the advice guys. I’ll stick with making a hollow bit. I’ll snap a few screws off in scrap hardwood and do some trial runs to see how clean it cuts.



These users thanked the author joshnothing for the post: Chris Pile (Wed Nov 24, 2021 4:27 pm)
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PostPosted: Thu Nov 25, 2021 10:04 pm 
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Koa
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Joined: Mon Feb 13, 2012 8:49 pm
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First name: peter
Last Name: havriluk
City: granby
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I think the hollow bit, riding in a guide, idea has the most promise, says him who's never done it.

Nothing's ever easy with old stuff. Good luck.

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PostPosted: Fri Nov 26, 2021 12:42 am 
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I’ve done this a number of times and found that making a hollow bit was the easiest way to get it done while leaving the least amount of damage.

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These users thanked the author SteveSmith for the post: joshnothing (Fri Nov 26, 2021 5:14 am)
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