Adding pre-flow to spool gun

[Gadgeteer]

What a great but simple fix to a nagging problem. Amazingly my ell cheapo Chineseium spool gun still works. against all reasoning. but I need a cover for the spool like yours has and the next time I need to use it I think I will incorporate your switch on mine.

Thanks! Considering all of the novel ideas that you have posted, I'm surprised that I came up with this one before you did.