An ideal valve would be this but with a quarter turn lever, but
     there does not appear to be such an animal in existence.

     I still think that Swaglok valve might work. True, it's meant for
     quick opening, but it's still a needle valve. If that pin is lifted
     up a little at a time, the flow increase should be linear. It looks
     pretty much the same as the Parker valve in cutaway.

     The only thing is you would have to replace that Nylon lever with a
     metal lever so you can hook up your Vernier cable.

     Regards,

     Gordon

Hi Paul, Gordon, int.al.
Why is the lever action so important? How often are we likely to adjust
the mixture? Mount the valve on the engine side of the firewall with
the shaft coming thru into the cockpit with an extension to the inst.
panel and adjust the mixture with the knob. I suspect the reason we
have mixture 'levers', is because  that is the type of  control on
Lycosaurus carbs.   If we retain the screw knob, it is "vernier"
adjustment already.

BR, Dave McC


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