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The base was a brake booster I cut up - but a brake rotor can work just as well. I got the flex plate, crank pulley and crankshaft from a Lexus ES300.
The pulley will be bolted to the booster.
Painting the base black:
I painted the crankshaft bronze and then masked off the chrome bits around the bearings to paint the balance weights black:
All painted:
Time to bolt in the pulley:
When stood upright, the crankshaft's weight makes it very stable:
I added some valves and springs to give clearance between the flex plate and some height and added a round glass:
Enjoy!