You only need one mechanical keyboard switch to make this work.

Recommended: Blue Switch for that loud, satisfying "click" sound.

Assembly: Just pop the switch into the printed base, place the head on top, and you are ready to start clicking.

I also recommend to put some glue in base to prevent the switch from falling out

link to switches that i used:
https://pl.aliexpress.com/item/1005004341695529.html?spm=a2g0o.order_list.order_list_main.5.784a1c24LZGDJZ&gatewayAdapt=usa2pol4itemAdapt