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[ed_h]

There is a hierarchy of Alephs, each one an infinity of higher order than the one before.

Ed

[ed_h]

It's first half added to its second half is also a perfect square. 275 + 625 = 900 = 30^2

[ed_h]

Is 3D printing an option? I printed a 4" diameter toothed belt pulley to slow down my sewing machine. Belt fits very well, works fine.
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[ed_h]

Considering what it is and its age, it is probably nickle plated. One of the Caswell should work fine, but there will be a lot of prep work before you...

[ed_h]

I have the Atlas horizontal mill with the change O Matic. Yup, some of my gears have grown a little. This weakens them, and end stage is that the teeth...