Without having seen said doohickey, this may or may not work.

I did it on the dome light switch handle on my first Volvo, a 1977 245. The dome light switch was a straight piece, moved through three positions for the light control. Center off, front with doors, rear on all the time.

The switch handle broke off. There was enough "stump" left to make a dowel joint. Drilled a 1/6-inch hole in each "stump", as straight as my calibrated eyeball could make them. Then I found a small nail, brad, whatever, that fit the hole snugly. Did some trial fitting and snipping. Finally covered the nail with glue (forget if it was super glue or epoxy) and stuck things into place. Used a rubber band as a clamp.

Worked like a charm, even though the switch handle had a tiny bend in it.

If your broken doohickey has enough stump, you might try this re-hab.

Good Luck,

Bob

:>)