What a difference! It cut not much harder than hardened steel does in aluminum. The tape was a spiral point so I could not get threads all the way through the hole before reaching the far side of the hole. I wish it were a spiral flute tap, they excavate the material as they turn. The hole was enough to turn a 1/4"-20 screw all the way through until it was in the hole. I now have a 1/2" thick counterweight. As soon as I have verified how many of these is the right amount for the Televue, I will epoxy them together.
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