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The 21lb counterweight bolts look like 3/8" 16TPI (UNC) steel, 2.9" plus the head, threaded for 1.5". I can't be sure what thread it is but in Losmandy style it will be some US standard. The have a nylon bit on the end to stop scratching the counterweight bar.
I'd be a bit sus about using aluminium. Losmandy and Casady both use steel.
Could someone weld/braze a handle onto the head of the broken ones?
If you break off the rest of the plastic is it a hex head that you could tighten with a spanner?
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