I have a Lee 2 cavity mold for my 9mm, it is the TC TL design and the bullet works very well in my gun. I have had a hard time with this particular mold and was giving up pretty quick on it and was thinking about getting the 6 cav version anyway. Today I was casting and literally having to beat the bullets out of the mold. I tried smoking it, I tried running it hotter. After about 100 frustrating bullets I decided it was time, I had nothing to loose.
I stuck the mold in the bucket of water and broke out the tools. Remembering a thread I read in this forum a while back, I took some bullets to the drill press and drilled a small hole in the back of the bullet. Took a drywall screw and ground the head off of it so I could chuck it in a drill. Got the valve lapping compound, squirted some in a cavity and put the bullet in, closed the mold and ran the screw into the back of the bullet. Much to my disbelief the bullet started to spin. I ran 3 bullets like this through each cavity.
Cleaned the cavities real quick with some Hopps #9 and a tooth brush and finally some mineral spirits. Started casting again and this time the bullets jumped out of the mold into the water. I was in such disbelief that this worked as well as it did. No smoking, no running the temps up, just pure casting fun. I must of cast 400 more boolits just cause it was so easy. I think I have given up on the 6 cav for now that's how much better this thing throws bullets. It now drops bullets better than any mold I have.
If you have a mold that is giving you fits try this out, I would have to say this is the best trick I have learned casting and from this forum. Can't even remember whom brought it up but THANK YOU for doing so, it is an awesome trick.