Friends,
Go to the top of this very page you are reading now, click on "Manuals", and save $10 and/or postage.
But don't be fooled by where it says "PDF-Manual of Hasselblad 501 CM". That link just leads to an advertising leaflet.
Read the 500 C/M manual you can find there, and know that apart from the fixed wind crank, the missing locking lever on the shutter release, the body ready signal (all features the 500 does have, but the 501 does not) all that it says in there also applies to the 501.