Comptometer Key

I created the following key design to match the keys of my comptometer, which is a model J. One of the keycaps of my comptometer had broken off twice. I glued it back together both times, but the second time I thought I should print a replacement to use in place of the original key. I went through several iterations until the key made a nice pressure fit with the metal post that the key fastens on top of. It fits well on my comptometer, and I hope there is enough consistency between models that it will fit other machines. I know that the keys on the model J have become quite brittle over the years, especially the white keys which almost universally look yellow by now. My hope is that if people have access to printable replacement keys, they will use them to restore more model J comptometers and keep these fascinating machines working in style for years to come.

There are two versions because the odd-numbered keys have a deeper indentation on the top than the even-numbered keys.