Toggle switch nuts... not sure about the exact size... and it might be cheaper to get the switch if you cant just fine one kicking around.
https://www.amazon.com/Jandorf-Specialty-Toggle-Switch-61155/dp/B01708FWES
Just go to Lowes in the lighting dept and buy the switch to get the nuts, entire switch is $1.50-2.00 range
Gardner Bender Black/Silver Toggle Light Switch
Item #87171Model #GSW-117
Specifications: 10 A 277 V AC/20 A 125 V AC/3/4 HP 125-250 V AC
Perfect for industrial equipment or emergency lighting
1.5 inch mounting hole required
Knurled nuts, bezel nuts, toggle switch nuts. There a tool: https://www.stewmac.com/luthier-tools-and-supplies/types-of-tools/wrenches/adjustable-toggle-switch-wrench.html?utm_source=google&utm_medium=shopping&utm_campaign=2020-07-gp&gclid=Cj0KCQjwpNr4BRDYARIsAADIx9wR8YpzbH94q6RjErK2bSE1Mi10SzTen6Icdbx1creIlH2B6euJkXkaAtoKEALw_wcB
Don C
Quoted from SantaEatsCheese:Clicking on this forum topic is the definition of a "risky click".
this was my first good laugh of the morning!
Radio Shack still sells a pack of assorted switch nuts ( # 6403020 or old number 64-3020):
https://www.radioshack.com/search?q=6403020
I can guarantee they will fit your switch.
The standard switch threads are 3/8-32, 15/32-32, and .475-32
Some Ace Hardware stores sell switch nuts.
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