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Bill,Your original understanding was correct. I must've worded my response poorly. It does have too much clearance right now. Well, really I'm sure it would be fine, but I'd like to tighten it up a bit. I hope to get some time to tune it up yet today.The real trouble is that I'm trying to make the slides and the valve guide from the same stock. The valve guide acts as a spacer, so either I need to make it thicker (e.g. using a shim or thicker stock), or I need to skim the slides to make them a little thinner. Maybe I should consider skimming a few thousandths even though that 10-32 screw hole is mighty close to the edges on the slides.I could keep the shim and skim the new valve guide (I'm re-making that, regardless) thinner. That possibility just occurred to me now.Todd