Design Prototype - C172S Mixture Control Lever

This is one of the prototype designs which I'll upload in quick succession. The reason for this is I've been working some time on some new instrument designs for the C172S, but lack the financial means to actually test and manufacture them too. These follow many principles which I'm not very familiar with and can't tell which tolerances work the best or if there is a better and more efficient way to do it, without physical testing at least. So I drafted some initial 'prototypes' as a starting point and when I will be able to build and test them, or if some of you from the thingiverse community decide to test them yourselves and provide feedback, I'll make the necessary updates.

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MIXTURE CONTROL
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This is a slightly more complicated instrument to build than the throttle lever since it has two movement modes. If the QRB (Quick Release Button) isn't pressed, the shaft should theoretically be stuck in a threading motion for finer adjustments