In looking at my '62 FSM, it shows an 'anti-rattle' spring that connects onto the heat riser flapper shaft. It is a short coil spring (not a sprial spring like the thermal spring behind the weight). The FSM shows it going on the back side where the shaft sticks out towards the the firewall. Does anyone have one of these on their cars and can take a pix showing how it was physically arranged or can describe this? I suspect it connects on the rear groove in the shaft and puts some drag on the shaft movement.

My 78 has one of those on the opposite side of the flapper weight right? Im not around the car now but Ill take a pic later... Cant really tell what it actually does, and almost doesnt even look like mine is installed correctly...?

Any one else wanna chime on in?

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"if it aint broke, fix it till it is"
78 Plymouth Volare Super Six wagon
89 Volkswagen Golf GTI 16v
92 Chevrolet K1500 5.7
98 Ford Escort ZX2 zetech

Yep, weight in front, spring in back. Thanks!