I have a Borg Warner Velvet Drive (model# 10-17-004) transmission that is having a fluid leak around the shaft to the shift linkage. Upon removing the shift linkage, I notice that adjacent to the shaft is a small hole in the transmission housing that has a spring in it. Should there be a ball on the spring that sets into a forward-neutral-reverse holes of the linkage? If so, mine appears to be missing. Perhaps fluid is coming out the hole with the spring and no ball to seal it? Any thoughts? Would you know the required size of the ball so that I can replace? Thanks!