This is pushbutton I made.

Inside is 12mm Waterproof 2 PIN Momentary  Push Button like this:

https://www.ebay.com/itm/363470297417?_skw=6Pcs+12mm+Waterproof+2+PIN+Momentary+Each+color+Push+Button+Horn+Switch&var=632689132509&itmmeta=01JGRT9327589B1732BB2JBCS5&hash=item54a0849949:g:TT0AAOSwqb1fuXIz&itmprp=enc%3AAQAJAAABIHoV3kP08IDx%2BKZ9MfhVJKl1vzTP%2BkNGNM%2FCcifyKQ7ShOZOhMcnQpwkDR4vXrCAIiBffwuCYVm6i%2BSQBVWmSQVthSXMOWaaW7Xhdmq4bpGF3WRLMk1PSQtogGT0D2YCec8vq5DybiqrA3CvvGFt6D9p%2FepDhriDh2Bz4xn9gpU01QCuttk%2FQZjG2IHV%2B%2FGZm4%2FjqHRPiQ%2FaQvt2BHjFqboQIaEeOPzM7GuMSpEEY%2BiUkMVYLkES1FsXnXbQm%2BVe5hVJXg0NqAWpQPmqmqJzwPCUDgAk6wvHHO5lD5MGN4D5svpY%2BXUw5kesWjN5VJKMJqRPpAKs2m0CGwAtZGXdyhh9KHc5k9z146H3X1DuDXsYLo3f8hFcYbx%2FDygT1KQ1Iw%3D%3D%7Ctkp%3ABFBMnLGkmoZl

It also uses two 9x35mm springs.

It is asembled with four M4 flat head screws