Instructions Print the Clicker Tool profile first to test the fit of your keycaps. If it doesn’t fit properly, enlarge the Clicker Tool by 1-2% until it fits just right. Once you have the perfect fit for your printer settings and keycap, enlarge both the top and bottom pieces by the same percentage.
You'll just need to insert 1 "clicky" key switches which are easy to buy from amazon or adafruit or microcenter etc.
Refer to the diagram below for the installation sequence
This video introduces the assembly process.
More clicker-related models, click the image or link below to view directly