PROP-2810 RADIAL ENGINE CRANKSHAFT for the Wright R-1820 aircraft engine. FSN 2810-00-306-5940, marked "prop shaft Bushings not bored". 4.6 x 12.5, 42 lbs sh.
http://www.fairradio.com/catalog.php?mo ... &item=1205
I don't know why, but one of my favorite sources for antique radio bits is offering these...
Thought I'd pass this along in case anyone is interested... No other deatais..
Robbie