Here's the secret:  Once you get it soft, twist and swirl.  This breaks up =
the leak channel into tiny bubbles.
After flame cutting, pull off any excess with stainless steel tweezers and =
then torch it smooth.

I've got that technique down cold, and have done hundreds of such seals wit=
hout problems, even when running at 50 microns inside.
Cooler torches help slow things down, a regular propane torch will work.


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