Hi All

My sunroof is currently in a poor state - it's shut, but the handle has come off from the spindle it sits on, which has lost half of it's teeth.
I can put the handle back onto the spindle, but it doesn't have enough grip to open the sunroof, and I don't really want to force it as I can see it shearing off the rest of the teeth. The handle itself seems fine.

What's the best option? Weld it back on, or replace something (and if so, what?)