Alan
This is an old thread. If your working on something like a 1X9 you can cut the tube on a 2000 series shaft and slip it over a shortened OEM shaft, drill a hole through the shaft and drive a spirol pin in it. The 2000 series coupler will bolt to the drive cup on the engine. On the pump end you can get an adapter from jeffinpa. On my 149 I converted the engine end, left the pump end factory for now because it's not in bad condition. No need to move the engine, just remove the four 1/4" bolts that hold the coupler to the drive cup and the shaft slides out. Here are a couple pics.
