when i was a compression mold maker i used a product from HAPCO. it was an aluminum filled epoxy alloy, very hard, machineable, threadable material. has extenders and retarders avalible in colors, gray, black, white. both air dry and post cure setups avalible in one gallon units, approx. $ 95.00 for a twenty puond unit. some preheating might be nessessary at 125 deg. for 45 min. shoulb be a snap to press bronze bushings for bearing surface. oh, a 1 gal. unit filles approx. 350 cu. in. or just shy of 21 lbs. try HAPCO.COM |