Dunlop Straplock Drill bit size?

[DanRJBrasil]

I need to enlarge the hole to put the Dunlop Straplock screw, which drill bit size should I buy?
Besides that any recommendation on installing the strap lock?
Thanks in advance!

 

[joeyl]

I have never had to enlarge the screw hole for a Dunlop straplok, most of the time, I would lube the new screw with a bit of wax (a NEW toilet wax ring is great for this purpose) and thread it in reverse (like unscrewing) in the original hole until I can feel the screw catching, then reverse direction and tighten slowly very slowly. Make sure the philips screwdriver is the proper size with no slippage

 

[Dave W]

Make sure the philips screwdriver is the proper size with no slippage

Just highlighting this point...

It's easily the most important aspect of installing strap locks.

 

[DanRJBrasil]

I still think the hole is too tight, have seen other people with the same prob , don't wanna go to the luthier, any idea what drill bit size would do the job? thanks

 

[BradMc]

Sorry, I use Schaller's not Dunlop's locks. No clue on screw size, but I think I can help you.

Don't worry about the exact size. Just take the screw with you to the hardware store and hold it tip to tip with a drill bit. Keep doing this till you find a bit that is just slightly smaller in girth than your screw. It needs to be able to bite into the wood a bit.

I recently filled in my hole with wood filler and a few tooth picks. Then did the above and drilled a new hole. Also, I advise screwing it in by hand, not a drill. It should be tight, but should not require extreme effort to screw it in.

Hope this helps.

 

[Biggbass]

If you HAVE to drill to enlarge:
match the screw shaft up to the shaft of a drill bit making
sure the drill bit is at least two sizes narrower than the screw...
You want it to be tight - so start small. insert a smaller bit into the hole to check depth so you don't drill too deep.
the idea is to leave enough wood in the hole for the screw to bite into the wood but still achieve a tight fit. So it's best to start small and enlarge as needed so you don't overdrill the hole.
Fill the hole with Elmers glue and screw the screw in with the proper screwdriver

IF two sizes smaller is too small, then try another bit one size smaller...remember....tight.
DO NOT drill the same diameter hole as the screw's most outer rings or you will be screwed...so to speak.

 

[Zooberwerx]

Use a 7/64" bit and drill 7/8" deep or 22.225 mm. Use a clean #2 Phillips head screwdriver. Ivory soap (or any bar soap) makes a great lube.

Precise enough?

Riis

 

[DanRJBrasil]

thanks thats what I need !! thanks a bunch Zooberwerx!
I live in Brasil, so its metric I cant just take the screw to a shop to measure it :/

 

[georgiagoodie]

I have found the depth of the existing hole just needs to be deeper (not larger), as the Straplok screw goes down further. If you don't make the hole deeper, that screw will hit the bottom and WILL NOT GO IN FURTHER without stripping the head.

 

[DanRJBrasil]

Thanks GeorgiaGoodie