Unless the shaft is over-sized and absolutely dead straight, it won't work. Tim's shaft taper relies on starting with a fullsized shaft blank and taking it down precisely. Another person's shaft has already been tapered, so it really can't be "retapered" like you want.
A shaft machine gets everything very close, but the final sanding is where the fine tuning of the shaft taper comes in.
You want a 8 inch straight tapper from the bottom of the ferrel straight back. Then take some meat out of whats left. When it looks right seal it up! I think a couple 50 or 60 shafts should get you started!
I did it on my first try. Seen alot of them though.
Nick
Leon Sly has Tim's shaft machine with Tim's custom and sneaky pete tapers programmed into it. Sly's custom cues #410-827-4966
Or just grab up the old sand paper and go to town. lol
"country"