Saab classic 900 rear main seal tool

thingiverse

It felt like somehow whipping this up and printing it was less work than buying a PVC pipe cap and cutting/drilling it. It worked for me, despite only going with 10% infill (as I half expected to have to print it again). I had to use washers, but it probably isn't necessary with a decent amount of infill. The original flywheel bolts will fit through the holes.