I'm lamenting the fact that I didn't do this sooner!
I have a 6.5mm kurz 6 banger that I got on a group buy a year or so ago that I've always had problems with. It never fills out quite right and I have to bang the heck out of the handle hinge to get the boolits to drop. I was about ready to give up on it when I tried the Leementing ttricks on it. First time casting after fixing the mould, it absolutely freaked me out that the boolits fell right out of the mould- in fact I dropped them right on my boots as its been my practice to open the mould, grab my dowel, then bang on the hinge bolt over a bucket of snow/water.