Bruce,
I have re-assembled the drive drum which I believe is now OK.
I had to use a lot of downward pressure on the mower when pulling backwards to get the clutch spinning.
Have checked the pawls in the cutting cylinder and there are operating OK, As I continued to repeat the action going backwards, it appeared to become easier. How much free travel is in the clutch operation?. There doesn't appear to be much between in contact and release?. One other thing, is it a dry clutch (in terms of lubrication between the cone surface).
I am convinced that your friend and yourself are right about the reversing process now so I guess I will check all gear trains etc tomorrow to achieve maximum freedom of operation.
Thanks for your help.
Pedro
