Hi All, installing the oil pressure relief valve in my timing cover today I noted that the OP11 spring compression is next to nothing( well certainly on my bike it is).In went the OP37 plunger, nice and free, spring(new-1&3/4" free length), and then the OP38 nut.I screwed this in expecting it to meet at least a little resistance as it began to compress the spring, but it was still possible to shake the casing and hear the plunger rattle until the nut shoulder was about 1mm from the casing.In other words, the spring pre-load is about that-1mm...... I know the Vincent pump is not noted for high pressures, but surely there is more pre-load on the relief valve? Am I missing a shim or something?? Bob.