With only the driveshaft
tube installed and the bolts only finger tight see if
the flywheel turns freely. If so tighten each bolt a
little at a time checking after each one to see if the
flywheel still turns freely and there is no binding.
Don’t go in a circle. Do the bolts opposite each
other till they are all tight or binding occurs.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.