I got an ISMI captured guide rod to mate with a 22lb recoil spring for my G20. The package came with a plastic/rubber type of washer and when installed with with the screw the spring bends it out almost around the screw. The screw by itself seems to hold the spring just fine....is this washer needed, it doesn't seem to be very effective as it is pliable with the spring in place. The instructions do not note anything about a washer but they really are not very in depth instructions other than to put the spring on - add purple or blue loctite and screw in the screw at the end of the rod...any help is appreciated! Wanna kill these ads? We can help!