The clearance was perfect. On a note the piston gudgeon circlips are just about impossible to install in a manner that would not be considered rough. I have made a tool and done some trial runs with the old circlips on the bench. I have yet to try it while the piston is on the rod. The special tool is over 500 bucks but does allow you to install the piston in the barrel on the bench which would be very nice. My way won't allow that as I'm thinking I will need all the room plus some. Hopefully on the weekend I will have a go.