Ah yes, I remembered it as not being anything drastic, just not necessarily obvious and couldn't recall the details.
Found the original exchange now, it wasn't on this group (which is where I was searching) but in normal emails.
Liam reported back then
"Actually the saddle wheel can be disengaged by pulling the whole wheel out by about half an inch, and when pushed back in to re-engage, it will only pick up its index pins in two places (180 deg apart.) There is a is a spring pointed grub screw (which people were tightening) its job is to give it the positive 'in or out' feel, not secure the wheel."