A real basic question.(I did a search but couldn't find this addressed). I own a 57 3100 with a 3 speed manual transmission. I had it rebuilt about one year ago. It leaks at the drain plug. More than just an occasional drip. I have tighened it slightly once and it seems pretty tight. Im not sure how much more I should do this. This leak just started a few months ago. Should I screw it down more? What size wrench should I use? Is it something special? I really don"t want to drain it (to fix/replace the plug) to fix this but i will if i have to. I need some suggestions please. ohwell

Thank you
Kevin