Thanks, Kevin. Money received and deposited in Vic. section Spares fund. Vibrac's idea sounds O.K. as long as the previous piston shows no sign of canting. Maybe have a block of wood at the right height to help keep the hone steady. I reckon tight in the piston at 20c. O.K. as long as it is free at operating temperature.
Thanks again Chankly, but I thought that you would want the pin rotating in the bush rather than in the material of the piston and therefore would want it firmish? in the piston? Totally open to correction by anyone!!
Kevin