I offer you a locking tool for crankshafts of different car models to change the V-Belt.It´s used in some models of VW, Skoda, Seat and Audi cars.The OEM-Number for this is T 10050
For educational purposes or just for your collection in this bundle there is also a gear, where you can test your locking tool.To 3D print something like this you need to have a dialed in printer, which can print 0.3 mm gaps.
Furthermore the locking tool is tested by a friend of mine which changes belts on cars regularly.