Looks like Kent uses a 2" PVC cap shortened with a hole drilled in the center, large washer with OD slightly larger than the seal, and 1-1/2" or 1-1/4 PVC pipe slotted to expand over the crankshaft, an additional slotted metal sleeve to fit over the slotted PVC pipe and some grease.
This reminds me of my race removal tool using a 6" long piece of 2" PVC pipe slotted to expand and fit over the race. Add some hose clamps to compress the PVC over the race and twist off or use a dent puller like tool to remove the race.