Well,
It can be tricky, whenever I mess with tiny stuff like that, I use a crappy Home Depot iron ( decent one $20 )
Then I file the tip ( way down ) like a toothpick about 1/2" back, plus I use a helping hands, with big magnifying glass on it!
Now
The 2 outside tabs ( on your connector ) the one that broke off, those tabs are only for stability ( oddly enough, so it does not snap off ) lol, but inner 2 ( smaller ) tabs are your COM leads, can't remember which is which? But anyhow, you might want a new one with better tabs, depending on how it broke?
But I would try reusing yours if it is still in good shape.
Keep tip as tiny as possible, very tiny dab solder, will be difficult, but you might be able to get it done, worse case scenario, no matter what you do, it will either work, or still be broke!
And at least you tried! Now I've seen boards as low as $35 on eBay, I got one for $25 of classifieds here a while ago for a wrecked vision!
( it was in a package deal, I bought several things at once, for a VERY good price! )
Never hurts to ask, but don't be impatient, some members aren't on everyday, so may take a few days, but I've always gotten a reply!
( sometimes after I broke down and bought new, bummer )
Hope this helps!
Take care, Fly safe!
J Dot
