The hot bodies (made by force I believe) .46 used to be produced. Nowadays Force makes a .38.
http://www.rc-willpower.com/Cart/index.php?route=product/product&product_id=15028

For the record on crankshaft play:
ASSUMING the bearings are seated properly in the crankcase, the front bearing alone locates the crankshaft front to back.
The crank and the collet sandwich the front bearing inner race. If theres play, you need to push the collet further down the crankshaft while also pulling the crank forward or pushing forward if you have the backplate off. There should be no play front to back ideally but a tiny amount is fine. Too much and you may wreck the connecting rod or crankshaft pin.