Short an alignment tool last time we changed the clutch on my Loyale, we poked around the garage looking for suitable substitutes. After trying a few different things we took a spark plug from the top of the motor "for the heck of it".

 

It worked! The size was perfect! The insulated part goes in first, and the clutch plate will fit very nicely on the angley part where the socket/wrench would go. Don't know how the circumference compares for other motors, but I would imagine it is very close and may be worth a shot if you find yourself out a clutch alignment tool.

I have used a 3/8" extension with black tape wrapped around it, and it worked for me.

 

Another trik is to leave the pp bolts loose, enough tto hod the disc in place, but with some wiggle room.

 

once mated, then tighten the pp bolts thru the starter hole.

 

Cleverness is great!