Use kapton tape or some other, thin heat resistent, low friction and electrically isolating tape.

By merging the two broken pieces and putting one piece of tape(I used 8 cm to make sure other parts will hold) on each side of the broken area.

Apologies of no picture of the result.

You can also replace the part with a new one: Part# Bosch 640243 from https://www.bosch-home.com/de/supportdet...