I have a watch that the strap buckle pin keeps coming out. The hole for the pin is slightly too short, not deep enough to seat the retaining pin properly. I have a drill bit just under 1mm diameter that would do the job and allow me to increase the depth on the pin holes by around ½ - 1mm on either side. The problem is the drill bit is too small for my me elec drill and my dremel tool, the chucks wont hold it and it just slides out. I have checked other bits and bobs but cant find anything that thin to use as a punch as an alternative. They are either too thick or not strong enough. Any suggestions?

You can get PCB drills that have a 3.2mm shank for a dremmel, and then narrow down to sub-mm tips, quite brittle though ... e.g

How to, small drill bit.

Nov 29, 2017 21 Replies

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The Natural Philosopher 8 years ago

PIN CHUCK

Google it

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Dave Plowman (News) 8 years ago

The carbide ones aren't suitable for use in a hand drill. You could certainly at one time buy 'ordinary' ones which were - Maplin used to sell them. But went blunt pretty quickly.

Other way is a pin drill - come with a selection of small drills inside the body. (they are a thing you twiddle by hand, so not a vast price_

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