The sprocket on my crankshaft was starting to get sharp teeth and a replacement was needed. This is a problem with the cush drive because its connection side has a special shape for shock absorption that is difficult to reproduce. And replacements are hard to get. On the other hand, normal hardened sprockets of various sizes are readily available on the market. Instead of replacing the entire unit, I had the original sprocket separated from its cush drive unit and had the latter welded to the new sprocket. This was inexpensive and has worked without any problems ever since.
Smart :D