Noticed my driveshaft coupling is leaking last night. Almost a drop a second. What is the best way to tighten it? When I looked, I saw a cotter pin through both nuts. Which confused me, because if I hold the back one and tighten the front one, the holes won't line up anymore. Do you guys have the cotter pin installed? Removing it scares me a little, but if you guys have been driving around without it, I'll get the warm and fuzzies to fix it.