The Barford would struggle even with wheel weights, the plough also lacks fine adjustment. Again not really designed to plough hard ground. Other machines that should cope with ploughing match conditions are Rototiller 56 or Rowtrac although neither has a great degree of adjustment on the plough.
Dave, the BMB Plowmate has two forward and one reverse gear. Not sure about axle, it may have independant clutches for steering, dont think it has a differential.
Good to see the Jetcut in use. If you take the old belt to a belt supplier they will be able to match it to a new one. If you do a google search for belt suppliers in your area or look in yellow pages you should find one.
An alternative to using loctite would be to have the collar a tight fit, then heat it before fitting and let it shrink onto shaft a bit like fitting metal tyres on wooden wagon wheels.
Keith, I use Plus Gas penetrating oil, original WD40 is not that good as a penetrating oil, although they do now make a specific penetrating oil. A bit of gentle heat might help.