How many different kinds of tiller heads are there? I have seen a few. The original from #108 looks to be cast aluminum and has a hairline crack from near the pinch bolts across the top. (will post pics a bit later, can’t now). We have a spare that looks to be investment cast stainless, it’s quite a bit different in shape and must sturdier so it’s getting swapped. But there seem to be at least three different versions.