As far as levers that won't tighten goes, there was a tip on one of the lists that worked for me. Use a rat tail file or grinder to remove two of the splines on each side of the split in the lever. It sounds all wrong but those splines aren't doing much and might be actually getting in the way. If the splines are so worn that the lever is clamping shut before it's tightening its grip then put 2 hacksaw blades together on a saw and run them through the seam in the lever. It's worked well on a couple bikes I've seen. Anti seize on the bolt threads probably helps. I know of one guy that used a stainless bolt, it may still be stuck in there.