help with mag build

hey guys i ran into a problem with my mag D build :( and need some help :)

when it was modding my switch on my mag D the tab for the NEG where the set screw is fell off and can not go back on

i tried soldering it on but the solder will not stick does anyone have a idea on how to fix this lol

PM me if you want me to send you one.

Put flux paste where you want the solder to stick.

yea thats what i did, still nothing but thanks for Old-Lumens im good to go :)