How to make a square "Korry" button on a pcb backed panel - MobiFlight/mobiflight-templates GitHub Wiki

"Korry" switch

The lighted square button used by many aircraft is manufactured by Korry Inc, and the real switches are very high quality but also very very expensive. This is an attempt to replicate the pushbutton variant (non-latching) Korry 389 with a Multimec 3FTH9 tactical pushbutton (link to mouser.com), two 3mm leds and a 3d printed cap that uses a laser-cut, painted & engraved top "lens" as the legend. The white text can be made visible with a blob white nail gel on the back side that works nicely as a light diffuser for the text too.

The particular pushbutton in question is made to use its own keycaps, but since it can accommodate a 3mm LED both in its center for a single led backlit pushbutton, or two leds on its "shoulders" for a dual led "Korry" construction, it does the job well. It's not as cheap as the chinese pushbuttons, but it has a very good click feel and if you use it for many panels, the price goes down if you buy a larger bag of them at once. And 10 million clicks should last for a while.

The button body 3d model can be found on the misc_files folder on this repository.

The finished button:

The 3d printed part and the square "lens":

The Multimec 3FTH9 button and leds work great on the 0.1" / 2.54mm hole pattern.