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Doh! I do that every time it comes up.
I didn't have a 5/64 so I've been using the 3/32 because I apparently don't know where the hardware store is. ;)
But, the 3/32 does work. I'm sure it's a...

Your drill bits might need to be sharpened.
Also, try a 3/32 bit instead of a 1/16 for your pin holes. I cracked three sets of scales before Glen gave me that bit of advice. I have not cracked any...