Stelpro automatic convector knob

This is a replacement knob for a Stelpro automatic convector heater. Dont know the exact model, but it is installed on a wall in a bathroom. The knob is designed to house an internal sleve that interfaces with the progn. I was able to reuse the original sleve from the broken knob. Sand and paint the color you need. Be carefull not to push the sleve all the way inside the hole.