RCBS Pro Melt valve pin

[Quickdraw4u]

Is the nozzle pin supposed to go in the nozzle hole on an RCBS Pro Melt or just sit on top of the hole? I think my pin is too big and won't seat in the hole. How is supposed to work? Thanks.

[MBTcustom]

The nozzle has two diameter holes in it. looking down from the top, you should see a hole that's about 1/4" in diameter that closes to about 1/16" below it.
The nozzle pin is about 3/16" in diameter and has a 45 degree chamfer on the edge of it. This fits inside the 1/4" hole and creates a seal when the chamfered edge connects with the bottom of the 1/4" hole, but nothing goes down in the small hole. The flow is simply cut off from above by the larger diameter pin.