[Licensed to kill]

I don't know if this is relevant or not but when i bought my car not leaked a LOT from the rear. Not knowing anything about Model A's, I asked here for a possible cause and one of the responses was regarding the drawback tube. I pulled the pan and the tube was missing. In fact, the boss that it screws into was broken (I have since diced that someone must have had the wreck slip while tightening the rear main cap nuts and hit the tube breaking it out of the cap). Anyway, I removed the cap and welded a tube back in place and reset the bearing clearance while i was at it. Took out a couple shims IIRC. While the oil leak didn't "stop" it was GREATLY reduced. Was this from the addition of the tube??, or the bearing clearance adjustment?? or both??. I dunno.