Apparently there was a lot of hand finishing on them. Fortunately they are supposed to be coming out with a new version at some point. I really love my Esco.They are very nice, I had one some time ago. It's unfortunate that ACUITY was never able to keep up with the production demands.
Thanks but I'm holding out for the real dealFound this custom made Delrin knob on ebay(and some other styles at lower price too):
tempted to pull the trigger, but feel like to hold until next time my knob burn my hand(hot or cold)