By the end of that spring, I could do short blocks or swap transmissions
in about 1/2 hour. Total time from putting it on the bench to test
running the repaired machine.

Sadly, I can do a clutch replacement in a Ford tractor with the same speed.
I can even lay out all the wrenches I need in the correct order. No small
job, this involves splitting the tractor. Poorly designed PTO clutch in an
application that stresses the s#$t out of it. And I got four Ford tractors

Karl