I have finally got it off, what i did i locked two nuts together on the opposite end of the shaft and held them against rotating with a spanner. I then used a correct size peg spanner on the wheel arbor and gave it a few sharp taps with a hammer and it all unscrewed the leather wheel was'nt threaded, but the end 1/2" of the shaft in the cone had been rusted up. Finally one last question can anybody supply the measurements of the lapping wheel cover, that is the diameter, thickness and the centre of the oil filling hole from the centre of the spindle hole please as the one on the machine is home made. Than you