Christmas tree

Apparently if you are in the know, you don't call it an 'input shaft' or a 'primary shaft', you call it the 'Christmas Tree' due to its uncanny resemblance to a christmas tree (presumably one in a robot world)

As we have already seen the thread has been sheered off my original one allowing the shaft to float and things to rub.  I think ive caught it soon enough before irreversible damage.  So circlip out, and a simple wooden drift to get the shaft out of the bearing.  Here you can see the original knackered one and the new healthy one.

Im not happy with the bearing though - too rumbly and full of metal flakes so that means another trip to Gransport to spend a bit more money