Fuel sender repair

Dose anyone on here know how to fix a fuel sender? I know you can buy new after market ones but my experience with them is they work on the top 1/4 tank then there inaccurate the one I have is mostly there and the windings don't look too bad but what ever sort of pointer is used to go across the windings is missing there is just a tiny 1/32 hole approximately that is there what I'm wondering is gas anyone ever soldered that tip back on?