Ed - Here's a couple of pictures that I just took of my method of getting the right out thrust set up. I used lite ply and sanded the angle in then epoxied to the firewall and then inserted the blind nuts with the mounting bolts through the engine mount, etc., so the pull on the blind nuts ought to be straight. Since I haven't flown the plane yet, I'll make sure to keep an eye on the nuts since you mentioned your problem. By the way, I am using Dave Brown engine mounts.