Hi Ralph, well since the pallet is aluminum it does not take too tough a tap. I have used 1/4" Craftsman (from a 40 year old set) to tap 100 + holes in an aluminum pallet I made for my mini mill. Never failed, it just kept on tappin..
The tap I just used for the 10-32 holes was from Dad's tool box. It is a Nachi GH3 made in Japan tap. Not sure how old it is but it is still sharp.
Cheers, JR

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