Yes, I've fitted studs to all the threads in the block and used nyloc nuts on them, just used bolts for the threads in the bearing housings. I've also untensioned all the nuts/bolts fastening the sump and re-torqued them to a lower value (nip them up, then nip them a bit more - very scientific). Of course the damage may already have been done, but as the engine is still on the stand being re-built I can pull it all apart and re-do it if I decide I need to.