Rick Oleson's site has some good disassembly instructions. I don't know if there is anything on the spring. The explanation and illustrations about adjusting the meter are excellent: http://rick_oleson.tripod.com/index-134.html
I have an RC, fortunately working correctly. However the RC has a hard to find filter size, 43.5mm. For mine I bought off ebay a 43.5 to 43mm step down filter adapter. It doesn't block the meter window and 43mm filters and hoods and lens caps are much more plentiful.
Just a heads up.