I've been thinking about fixing a metal plate to the underside of the handbrake lever so that better pushes down the switch plunger. An oblong bit alloy, epoxy and a file plus 2 zip-ties should do the job...... but I might wait till the new zip tie fails...!
The zip-tie also is needed to hold the leather gaiter to the polished hand brake grip. Close inspection showed that the zip-tie seems also to bridge the gap between the two sides of the hand brake lever, which is a "U" section pressed metal part with the ratchet in the "U".
Actually, as the car is an Automatic I rarely bother to apply the hand brake....with the transmission in "P" the engine acts as a big parking brake!
