Here's the modification with JB Weld. It's the JB Weld epoxy mix, not their silicone mix. You mix it in the bottle and then insert a dollop down the nipple hole. It's a liquid so what do you do now? Wait for it to firm up some and when it does use your pointy things to shape the flash hole. Also insert your nipple in and out to keep the threads clear. Also use one of Alice's dental picks to clear your flash channel. Once it cures it's like solid steel.
(See updated view below).
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