Hi, This unmarked alternator came attached by an A belt to my first CS6/1 I just bought All that's left of the alternator boiler plate are 4 painted-over rivets. I removed the pulley and took the rear-end covers off to have a peek inside. It works OK 230v 50Hz at 1500 rpm, but the bearings seem slightly to be showing their age. I'm a novice and would appreciate any pointers about manufacturer and model as well as hints whether it is a jewel worth servicing or if it is end of life and worth replacing. How free-running should an alternator be when I give it a spin by hand? This one does about 1 revolution. Cheers, David.