I have had a couple very useful and still have a few spares. However they were quite a lot of trouble, I am not sure but apparently the wiring was not very sophisticated and part of the problem.
I don't think they make them any ore.
did you ever give the engine an oil change? rugerini is the name of the lump. i have found what appears to be the oil filter( a 17mm bolthead on the side of the block with "oilio filtro" in Italian stamped on it.) I couldnt loosen this nut even after applying pressure but then noticed just below it a smaller bolthead (13mm) that didnt seem to be doing anything. Is this some sort of anti vibration locking bolt? Does anybody know?