I got the drive pulley off this morning. Found why it had been welded on. No key.
Next job to get the shaft seal out. No way was it coming out with shaft in place, so no choice but to remove the shaft. That started an in depth lesson in Wheel Horse transmission boxes. I'll not go into to much detail , suffice to say you do not need to remove the selector forks shafts. The detent balls can be a right pain to put back.
Anyway, I now know what bearings and seals are required. I also now require the shoulder bolt for the high/low selector fork. Slight mishap and it's sapped the threads off.
This is what it looks like if anyone can help with a replacement.
In one piece, please.