So I have a question, after reading up on what I think I would want to see in a roller lifter why doesn’t someone make a solid lifter with the tie bar in board, with an very small drilled orifice leading to the oil galley feeding oil pressure to a bushing? It would solve the oil pressure loss issue, because even if it uncovered the hole its too small to dump that much pressure and it would not create an open path. Its not like its spinning in the lifter bore. Drill a small hole to feed the axle and the pushrod! You can cut the smallest oil band to lube the lifter bore if you need to.