It's a manual push-pull for choke and I know people flying everything from small gassers like FPE 2.4's to Lesebergs DA 200 using that system. I bought a Dalton 35% Dalton 260 kit and that's how i'm going to choke my engine. I'd do that with my 3W 56, but it's a rear carb engine and doesn't have the locking mechanism. If I ever do a Wild Hare 28% Extra 300 and BME 55, that's how I would do the choke. You lose the weight of a choke servo in the process and it's less complicated. Just be sure to put a rubber grommet in the hole as the above picture shows. The control rod for the choke arm will vibrate around and chip your cowling up.