Thanks all for your help and warm welcome
Had look last night and it looks like the engine is pretty easy to remove, so will have a crack at it this weekend. I've got two mostly complete mowers, so I might just swap over the clutches for now and then try fixing the worn one. Where can you purchase new cork? The cork in it is not too bad, it's just in two parts and not glued, so I guess I could just glue this back on. Looking at an old post I'm assuming Kwik Grip is the commonly accepted best adhesive?
One of the reasons I have two mowers is the first one I brought (green Scotty in second photo) doesn't have a solid rear roller, it's roller is in two parts each about 10cm wide, anyone seen this before? Seems odd to me.
Finally a big thanks to you regular posters on this forum, while trying to swap the blades / cutters between each mower I couldn't get the sprocket off the shaft, it wasn't till I read these forums I learnt about a gear puller which made my life a lot easier.
