With out wanting to sound like a farmers son, fencing wire and pliers in hand;
Could the friction plates be adjusted across on the axle so that you got more fwd drive and less reverse??? Not as a fix but for the purpose of diagnosis.
Could you get more movement to the clutch by allowing more movement at the pedal via the linkage??? I realise this will give a bigger gap between fwd and reverse.
Reading through the thread (quickly) i was wondering if the linkage was binding or hitting some sort of stop in the fwd driection and that was effecting clutch engagement.
But i assume that deviates from how its meant to work, Correctly.
Pictures and explanations please, Very intersted to know more about how these drive systems work.
My old greenfield has no drive, either way. I think its something to do with the fact that the pedal is rusted to its piviot and the linkage will only move as much as the pedal post will flex.