Holley 350 on my 65 Mustang question

I have been restoring cars for over 25 years and I can not figure this one out.
I just put a new Holley 350 carb on my 65 Mustang, no problem. what I can not figure is how does the electric choke's Bob weight return to the set cold position. The weight is not attached to anything, proper operation is for it to be loose and free moving. I understand how as the choke heats up, the bi metal unwinds, thus moving the butterfly rod to the open position. at the same time the high speed idle set screw slips off of the Bob weight's notched steps allowing the idle to slow down. But how does the bob weight re position itself to the cold position under the adjustment screw. Is there a spring missing that lifts the weight back up. I might be old school, but this one has me stumped..
Thanks
Woody

Are you referring to the coiled bi-metal spring inside the housing or a separate external spring attached to the Bob. I understand what you are saying, but if it is the internal spring, then it can not move the bob weight because it is free floating.
If anyone has a picture or a pictorial it was be very much appreciated.
Thank you for you advice and input
Woody

Is the bob weight supposed to be positioned below, or above the spring linkage cam.
Thanks

Anyone, PLEASE take a look at your holley electric choke and tell me if your linkage from the butterfly which goes down and turns to the choke, IS THE LINKAGE ABOVE OR BELOW the red bob weight.
Thanks