I've put my rear coilover back together, matching the pre-load on the other unit that was not taken apart. There's one stepped nut that pre-loads the spring, and a second flat spanner nut that locks the pre-load nut. I have a spanner, but to get the lock-nut tight it appears that I need two, holding the top nut with one while tightening the bottom nut snug. Am I overlooking something? Is there an easy way to lock the nuts with one spanner?