Watched one at work once, it was behind a T 20. Clutch manufactures gold mine!Talking to a chap at harvest who was talking about early square balers and how the wooden sliders would be worn out after one or 2 seasons.
They got an Allis Rotobaler
Claimed it was slow going on a dead drive PTO tractor.
When it was time to tie the bale you had to stop and out of gear, restart PTO, tie the bale, clutch down again, into gear and restart PTO and carry on.
Bales a nightmare to handle and stack.
Used far too much string too, until they found different sized pulleys/sprockets for the twine feed which made it much better.