No need for the tool....

Use a high quality socket of the appropriate size, along with an M8 bolt and appropriate washer.

Turn the flywheel until you can see the M8 mounting bolts 6-8 total.

Remove one bolt, and replace with your M8 bolt with washer and socket. Tie it down tight, and go back to your work...your crankshaft wont turn with the socket up against the flywheel housing.....which is very strong (even enough to torque the crankshaft bolt to 300+ foot pounds.....I know this first hand because I refused to get a flywheel locking tool.

Happy wrenching!