Finish for the electrode applicator

One embodiment of finish could be to cover the ElAp with a cloth - a fabric of the users choice. It could for example be an old shirtsleeve.
It could be applied using two velcro strips which holds the fabric on place

Not clear? If you ever fly notice the headrest that some airplanes use, for example easyjet. They are just held by the hook side (male) of velcro.