I'm in the process of renovating a .22 Webley Mk3 rifle No. B2068 and would like to know what the original spring length should be for a new spring ? The one I removed from the gun looks too good to be original, it has 30 coils and looks like it's got plenty of life left in it. Also, can anyone tell me what piston washer this gun should have, leather or whatever else they used ? I was expecting to find leather but it had a plastic/nylon one fitted held in place with a metal washer and screw. Thanks.