Finally able to assemble my bottom end on my rd400. Tried tapping in the transmission shaft plugs and had one mushroom over on me. It might not have been 100% square going in and I did not put lube on it. Is there some trick to this I'm missing? Don't wanna ruin 2 more, they are $15 a piece.
Try a closely matched socket to drive it. Mine actually was not tight, and blew out on me twice until I smeared the OD with Hondabond.