I made some from 1/4″ carriage bolts. From 20′ away you couldn’t tell the difference. Laugh. I machined away the square shoulder under the head., rounded the lip of the head, slotted the head, cut the shank to length, drilled the shank and pressed in a pin. I used galvanized bolts but they are available in stainless as well. As far as the receptacle, I think the best source is a junk motor. Message me if you strike out otherwise.