I got a new Lee C312-155-2R mold last week. Last night I prepped in my own manner. I take them apart as far as I'm able. The sprue plate screw is now a regular screw and came out easily. I do that to take down any ridge around the screw hole that can lift the plate. Then I use a fine emery paper disc on my Dremmel tool and radius the bottom edge of the sprue plate and the top outside edges of the mold halves. I thoroughly clean the steel parts with 91% rubbing alcohol. I then scrub each mold half under hot running water with plain bar soap and a tooth brush. After drying with a paper towel, I then clean them with Q-tips and rubbing alcohol. This gets the mineral deposits from my water out (I hope).
What I found was the mold handles can be removed from the mold halves with an allen wrench. The pins are a self-tapping type with a steep spiral threading. I got mine back together working very carefully to engage the threads correctly. I don't recommend doing it, but I was curious, and I won't be doing it again.
The mold cavities are beautifully made and it produced excellant boolits at exactly .313 with #2 alloy. It took a while to get it to operating temp, and needed a steady rythmn to stay there. I think that is because the new mold block design has less mass. It's narrower on the bottom than the old ones.
I would say that these, for the money, are the best entry level mold out there.
I'm sure that others here must have them and may have posted about them, but I had to add my 2 cents.