Looks similar to ceiling fan switches I have here...maybe HD, or an electrical supply house. Failing that, most hardware stores should have a black rubber cap in their loose nuts/bolts/etc bins that would cover the white and make it easier to grip.
Underestimate me, that will be fun.
GREEN WORM RACING--since 1959
These are my opinions...YOU are responsible for YOUR decisions and YOUR outcomes...AND, my not arguing with you does not indicate agreement with your opinion.