OK, so got a nice little 630 cheap. Engine was missing as well as the coupling and the oil cooler. So the pump is a taper shaft with a key. Was wondering if anyone has used a different coupling than original, and what they used. I also have another Wisconsin engine but it is a straight shaft. So thinking a love joy coupling from the engine to the pump. But before I start building and buying parts thought I would see what others have done. Would prefer to buy what I need, but don't want to spend a fortune since I don't know how good this machine is yet. And if anyone has parts for this old girl, like the afore mentioned oil cooler ????..... Thanks!!