Stop in for a cup of coffee

I've been trying to buzz up windfall, have had trouble with my saw. Recently changed the clutch so I'm surprised that the sprocket is already worn. Haven't pulled it yet but think that's what it has to be, saw revs but chain no go (with brake off of course). Will take it apart (gotta remember reverse thread nut!) this weekend to be sure it's a 7 spline, then order.