where to get betor/ceriani fork cap springs.

[stainlesscycle]

i've tried replacing the springs for betor's top cap valve assembly - the tiny ball bearing/spring deal. i have the proper size bearings, just can't find a spring that works well. i'm sure it's a cheap little spring, just can't find them anywhere. i've got 5 or 6 pairs of these forks, and the spring has disintegrated in most of them.. i'd rather not buy the whole cap assembly, which i've found nos.. anyone here found one that works? i believe it's a 3.5mm compression spring, can't get wire diameter/free length from any that i have, they're all rusty/falling apart. i think 1 1/8" compression spring will work, but i have no idea what the spring rate is. i know it's goofy, but if the rate is too weak, they spit fluid at every hard hit.. and if too hard, they build pressure too fast, and blow seals/make for a hard ride. mcmaster has a few sizes, hate to buy $25 worth of 100's of springs to get the right one..

i guess i could order a random set with the correct diameter and see if the rate is too high/low and through process of elimination figure it out.