I was in the middle of a long casting session this morning with my Lee 358-158-RF(recent purchase, 6 months ago) when the boolits started looking a bit off center. I wasn't doing anything different so I couldn't see why that would happen.
I stopped casting since it was time to refill the pot anyway and let the mold cool off.
I was picking up the boolits out of the water dish( I water drop) when I came upon a small metal cylinder with a tapered point on one end. It took me a moment to realize what it was.
Apparently one of the locating pins had popped out during the run. Probably about the time I noticed the problem.
It turned out to be an easy fix. I removed the mold from the handles, slid the pin back into position(it went in easier than I thought it should have) and tested it to make sure the mold closed properly and wasn't loose at the pin.
Then I staked the pin back in place on both sides of the mold(inside and outside) with a small screwdriver and a very small hammer as Lee aluminum molds are easy to damage if you are too rough with them. Checked the mold again for alignment and closure.
Then I reheated the mold and continued casting for another 800 boolits or so.
I have cast thousands of boolits with Lee molds and never had that happen before with a 6 cavity. I have seen it with 2 cavity molds though.