Summary

A base for Military Surplus J-37 or Ameco K-4 Morse Code Keys. The 2mm spacer goes between the key and the base to allow you to adjust the height of the key off of the desk. The profile of the J-37 base is not perfect, but completely functional. The two holes for the Ameco key were and afterthought. You're probably going to want to put some rubber feet on the bottom of this to get it to stay put.