It`s a lee thang !!
On the 2 holers they use a self tappin screw & when it "selftaps" it raises a little ridge around the screw making full contact with the top of the molds impossible .
The fix is to carefully remove the screw (use a good screwdriver) & work it out , then level the top of the mold on glass & 600 grit.
Hit the sprue plate a lick to see if it`s flat also, it may need adjustment to.
The screw won`t hold again unless ya drill & tap a 8x32 screw from the side to lock it .
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GP100man
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