Removed the retaining clip on the back of the knob with needle nose pliers. Then pulled the knob off and discarded it after finding the matching knob on your web site. I ordered the knob with the retaining clip which you sent that day and received it in three days which was fast. I took the knob with the retaining clip in place on the knob and pushed the knob all the way down on the shaft until the retaining clip seated its self into the groove on the shaft. I didn't have to place the knob on the shaft and then insert the clip, That's it.