I picked up a haybob yesterday described as a PZ Haybob Mk II and found a manual for a similar machine on line. One thing, there is no centre board or what the manual calls a "levelling board" on mine nor can I find one like it on Google images either. I've looked carefully and the only fixing points (if that's what they are) are a couple of holes near the head stock, one blanked off with a bolt and nut that doesn't seem to have any other function. Maybe the manufacturers didn't think it needed one. Comparing this model with others, the rotors do seem to be closer together and the tines will probably clash occasionally until I can get around to adjusting them. Any thoughts?