The clutch centering tool is not crucial for reassembly. I've put together numerous clutches without one.
Leave the six clutch bolts somewhat loose so that there's enough friction to hold the clutch plate in place but it can still move. Feel around the edges of it and get it roughly centered. Without the pushrod, wiggle the transmission on until it mates with the clutch plate and silde the transmission all of the way on. (You're effectively using the transmission as your centering tool.) Pull the transmission STRAIGHT back and off.
Tighten the six clutch bolts.
Slide the transmission on once more just to be sure.
Lube the transmission input splines, insert the pushrod and install the transmission. Easy peasy.
Last edited by FlyingDuck; May 27th, 2013 at 1:00 am.