It's sometimes hard to get a good grip on the two halves of the light switch to press together then twist them apart.
If you cut two 1" wide slices from an old bicycle inner tube to make wide rubber bands, then slip them onto the two halves, you'll have a much better grip.
If you cut two 1" wide slices from an old bicycle inner tube to make wide rubber bands, then slip them onto the two halves, you'll have a much better grip.