The update (below) got its start on the forums (for context) here:
Trouble Reaching Mihec Molds
This is also written there (and no apology for the double post).
A SHOUT OUT of THANKS to Miha Prevec for the plethora of HP pin sets, alignment posts, and lock washers sent to me - gratis. Miha sent each of 4 different HP pin styles, incl. a solid. Doing the math that’s 32 alignment posts, 16 HP pin sets, and 10 lock washers. Maybe to Miha that’s a “drop in the bucket” compared to the thousands he ships, but it is A LOT to me and I am grateful for his Customer Service.
My APOLOGY for the ½ dozen emails I sent to sales@mp-molds.com (same one over and over) as I received error message after error message in its transmission. It was not my intent to be an annoyance.
How this thread started: I purchased a pair of new and unused brass MP molds from a Castboolit Member. One, a 4-cavity MP 360-156, HP and the other a 2-cavity MP 358-429R & 360 PB. I heat treated the four mold halves while waiting for handles.
For personal reasons, it was 54-months(!) before I poured lead into ANY mold – finding then that the 2-cavity MP mold would not accept its “as purchased” HP pins & posts. I perplexed and procrastinated a while before contacting MP Molds (shifted instead to a 22 Bator and an RCBS 22 mold in the meantime).
A pair of MP alignment posts are required per HP pin, that when these three parts (a "pin set") are screwed together form a “U”. Pin sets are inserted into the drilled mold half and are supposed to slide smoothly into and out of the mold for boolit release.
The pin sets purchased bind into a (theoretical) “V” in the 2-cavity brass mold. Post alignment holes in the 2-cav. mold were drilled farther apart than the holes in the 4-cav. mold.
Comparing the molds for alignment posts and holes:
1.) The 2-cavity mold was drilled ~0.490", out-to-out.
2.) The 4-cavity mold was drilled ~0.450", out-to-out.
“Common” HP pin sets (as purchased) will not fit. All purchased pin sets are ~0.450” out to out. Force fitting mold halves together, seeing a lot of daylight, binding the pin sets, and potentially galling the brass, because the as purchased HP pin sets do not align, is NOT the way these molds are intended to operate for the swift release of boolits.
Miha believed (correctly) that I may have received the wrong pins for the 2-cav mold, so he sent a 4-pack (3 YEARS after my 2nd hand purchase) – and they WORK GREAT. Now, with new posts and HP pins, the 2-cavity mold is ready to pour and I am ready to use it!
MP Molds - Superior product! Superior Customer Service!
I approve this message - Land Owner