I've had switches that come out of the slot/track rather easily and some that were pretty stuck from age and rubber degradation.
There should not have been glue used, if it is original. The switch has a wide spot that tucks into the slot, so should come out.
Start at one end and pull it out. It if is already trash, it doesn't matter. Your priority is to NOT screw up the wheel.
If any pieces and parts are left over, use a very tiny blade screw driver or a dental pick to remove leftover pieces.
The whole channel should be smooth and free from rubber bits.