Feel free to customize.
Requires a basic SPST 6x6mm button, which can be scavenged from computer mouses, household appliances, etc.

Fusion360 & Simplify3d sources attached.
d=2.5 & d=3 denote a distance to the lever.

ifancybox 3

No

Yes

0.1

100%

Do not place supports in the button area, the are not necessary there.