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I feel you, same here. I try to buy in metric just in case I need it for something else in this wonderful engineering/robotics field (Though I have no idea what I could possibly need 13mm nuts and bolts for...), but if I gotta go for the inch standard, I guess I'll bite the bullet... I feel dirty, though. I just won't tell my printers... shh.

Thank you for getting the weights for me, that was more critical than anything, I agree. I might even try just making a pause-and-fill 3D printed ballast that uses steel shot... once I figure out the exact cubic volume of the weight in .177 steel shot... I just gave myself a project, didn't I?

I might play around with the design with the teeth and see if I can't come up with a way to rigidify (I swear it's a word... Even though my browser disagrees) them, because I see what you mean. If I come up with anything, I'll remix it, for sure.

Thanks again.