Button/Switch for bicycle handlebar

thingiverse

Handlebar mount for 12mm push-button or switch. (example: https://www.aliexpress.com/item/1005002356881417.html) Print the 3 parts, insert the button from the front and the nut from the back, then thighten down the button. Insert cable in "plug" and slide it until it sits flush against the back of the housing, than use a solder iron to melt it in place.