I have what I believe is a G&B 90 gas pump that is missing it's ID tag, I'm working on the pump and need some help removing the knurled knob that resets the clockface hands. I can not tell how the knob is removed from the shaft that passes through the clockface glass and would appreciate hearing from any member that has experience with this model pump. Attached are a few pictures that show the pump and knob I'm talking about. Any help would be greatly appreciate. Thank you. Marshall