Argh. Wire coathangers need to come back. They were so useful. Are plastic coathangers useful for anything beyond hanging coats? I think we've lost an important bit of hacking kit here.
The crankshaft for this stirling engine (http://www.physics.sfasu.edu/astro/courses/egr112/StirlingEngine/stirling.html). I was hoping to get it done tonight, but I'll find something that works tomorrow.
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