spinning

Hi So I'm dealing with a shallow well jet pump. It froze and cracked the casing (not the motor side) with some cold weather we had a couple weeks ago... We JB Welded the crack put it back on but a pipe was busted inside the house so had to shut off... It also still had a small crack in the back...

I have been fixing the cartridges for the MOEN Monticellos that came with my house. However, when the handle for the cold water fell off for my Tub, I thought it would be as simple as removing it and re-tightening the screw. Not the case. The Hub is just spinning... and won't come out. I have...