My 4500 was initially misaligned but with a little time has worn into alignment, or should I say it got sloppy enough that all is well now. You might try just putting some bullet lube on the stem to just stick it in place. While the 4500 has done fine with time, I would probably buy the RCBS unit if I did it again. I've since come up with a 45, which has done fine too, just seems to require more effort.