Atlas 3/8 inch square crank handle source?

Fabricate your own. If you don't weld, read up on it and fixture up a bunch and take them in to a pro. They have a minimum charge, and it is much better to take them to the shop than to ask for mobile service.
 
Picture shows square hole but they do not offer it at 3/8. So you have to 25/64 drill and broach the blank 3/8 square.
 
I drill mine 1/2 diameter .700 deep and finish it thru at 25/64 and broach to relieve the stress on the cutter. Leaves plenty to engage.
 
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