I didn't pay that much attention to what he was telling me--just that the thing came loose on him and the belts got tangled somehow and he told me since im doing a swap to make sure not to use the kind with the screws around the hub because it was a bad design, and I have two good ones so--How do i get the oil out to start with fresh as allabassy said. Im going r12 and it looks like by the fittings in parts car(s) that none were ever changed over.