We released new 3D-printed capsule handle shells in late November 2019 with an integrated knob handle. The design is much improved and we recommend updating your capsule handles:

Instructions below are for the older model capsule handles: 

If you need to install a new knob on your capsule handle, here is a quick video that should help out: 

If you run into any trouble or have any questions after checking out the video, please feel free to contact us.