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Grub screws


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Depends on who made it!

Some that I have had are 2mm Some are 3UNC one was 2.5metric so I generally re-drill if I get a problem to 6BA(2.95 tapping drill!) and re-tap replacing with hex grubs which are much better than the screws who's heads eventually shear.


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  • 3 weeks later...

Wow, spent the afternoon trying everything I could find.

...M2 fell straight through

...M3 went in half a turn

...8BA went in OK but 'felt' loose

Anyone got any ideas?

Otherwise my plan is to drill and tap new M3 holes.

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