Just cut it off and file it smooth very carefully to avoid cutting into the stay. No reason to introduce heat where its not needed. Those Bernzomatic torches are more trouble than they're worth. I went that route and burned through a lot of $10 oxy bottles just building one frame. It really sucks when the oxy runs out in the middle of a joint and the straight mapp soots up the joint, requiring you to clean it and start over.