I got a pair of "Winchers" for my P21 to help get the keel up. They were the very devil to get on (fairy liquid and loads of brute force) and although they worked after a fashion they did increase the friction in the system so I had to use the long winch handle.
I changed the blocks in the keel tackle for ball bearing blocks and now I can pull the keel up just by pulling the rope. Need gloves, but it's a whole lot less work than the winch!
I still have them somewhere! They must be the most expensive rubber bands ever.
Geoff Hwrood P21/30 Cygnus