Something I have done on these six holers for years, and it's worked for me, as I have micced them and they come out pretty dead on is when I close them with the left hand, I have the little sprue mallet that I use on most of the "other" moulds and just lightly tap the bottom of the mould halves while closing. This seems to let the halves close a bit better on those line-up pins all the way. I reject dang few this way.
My two pesos
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