My COE Page 374

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What you see here is an older version of a 425 Impco Gas Mixer.
I have been attempting to hook up the linkages to get it all working in sinc
The Flat bar that attaches to the mounting bolts on the left is mainly there for the return spring attachment

Now if you look closely at the bronze lever you will see a long stainless screw that will
hit on the bent flat strap when it reaches full throttle, if the screw and strap were not there
then the butterfly would open past centre and lock up the butterfly.

Here you see the mixer at full throttle with the screw con acting the underside of the
 bent strap, that bent strap actually goes under the butterfly shaft otherwise it would
 allow the long stainless screw to slip past it and jamb up at full throttle, not a good idea !!