I've been using a Lee bottom pour pot for 20 yrs. Like pretty much everyone else, I got the "Lee-drip" off and on at varying degrees. Also reduced flow...sometimes down to just a dribble. After following this thread for a while I decided to take some of the advice offered and work on the pot to see if I could at least make things better.
Once I got the pot empty, I removed the rod and handle assembly, cleaned the pot thoroughly, buffed out the interior with steel wool, then went to work on the rod end and, the "seat" area the rod drops into and the drain hole (spout) itself.
I used a small drill bit to clear a buildup of crud that was in the hole but didn't actually remove any metal. Once everything was clear, cleaned up, and polished with 4/0 steel wool I set it back up, loaded with lead and got to casting.
Folks....that 20 yr old pot worked GREAT. I had forgotten how pleasant it is to use a good flowing, NON-dripping bottom pour pot.
Throughout the subsequent casting session whenever the flow rate appeared to be diminishing a little bit, I cleared the spout with a bent paper clip and got the "full flow" back. That's a metal issue..meaning my ingots aren't as clean as they should be, and I'll just deal with it.
Results...????
Using a Lee double cavity .395 RB mold,I cast 725 balls that day. I'm one of those guys who weighs my balls before putting them in inventory for shooting. My personal acceptance standard for 40 cal. RB's is +/- 0.1 grains from nominal. When I was through weighing the entire lot, I only had 25 balls that were outside my acceptance range.
Your experience may vary, that was mine. IMHO: The time it took to clean that old pot up was definitely well spent.