Hardware store question- Anti twist washers for stompswitches?

[Processaurus]

You know those odd washers that come with toggle switches, that have a tab sticking out that curls up a bit at the end, and a tab inside the hole, that are used so toggle switches don't twist?  I was wondering if there were such a thing in the odd (and large) 15/32" or so diameter of stompswitches, so you can retighten them from the outside of the box without the switch twisting, or having to open the box.  Might be a nice alternative to the white nylon washers, if they're out there...

Like the washer that is all the way to the left:

[petemoore]

  Have not seen any, don't know why.
  Once I get a washer tightened down like the one second from left in pic, I haven't exp'd nuts that came loose, problem is though, sometimes I can't easily hold the switch in place from twisting while tightening the nut..I could use a 3PDT blue wrench, two flat blades, parallel-match the side of the switch, [preferrably at the metal plate] on a handle, a duck-billed cresent wrench affair.