Leaking 727 Transmission Neutral Safety Switch

Has anyone found a new 727 Transmission Neutral Safety Switch that doesn't leak transmission fluid through the electrical pins (not talking about the thread that screws into the side of the transmission). After reading many posts, this seems like a common and annoying problem. I have bought several switches and am currently using this one sold at NAPA:
ECH NS6562 Neutral Safety Switch, w/ Automatic Trans,
I have tried suggestions by sealing where it leaks, but, after a few months, it has begun leaking again. Has anyone found a 727 Transmission Neutral Safety Switch this will not leak?