Stripped the rear axle down today and can see why one of the wheels has bolts going through it. At some point the wheel must have broken so it was machined to remove some of the inner face and the centre has been machined out removing the taper fixing. A steel hub has been made and the axle machined with a new, smaller taper. I must admit that whoever did the work made quite a decent job of it bur it does leave me with a dilemma. To get it back to original I will need a new wheel and rear axle. The axle isn't a problem as I can machine a new one but the wheel will, I expect be almost impossible to get hold of unless Greenfield have one laying around! So I'm just going to replace the axle bearings and maybe make it so that the bolt fixings for the wheel are less obvious.
I've also taken the clutch off the engine and the good news is that the clutch lining is still in very good condition so doesn't need replacing but the bad news was that the clutch / pulley was cracked and had been welded (badly). I've now rewelded it and machined the face so that it runs true against the clutch lining. It's a very simple and clever mechanism and I'll be taking some photos of it tomorrow together with the rear axle.
I've also ordered new belts for both the drive and cutter, and will post the sizes once I know they are the correct ones!