if the switch is small, u try slowly drill it, then file it until smooth

why failed?

1st use the smallest drill bit u can find, the smaller the drill bit the easier to make a hole..
after u get a small hole u can proceed with bigger holes by using bigger drill bit.. slowly until the hole can fit the file then u can make into shapes that u wanted..

or maybe can just send to engineering ask them to help out

ts u must have patience when doing this kind of detailing job =D