Thanks guys for your feedback. I have done the extension route a few times on needles that come straight out the side and are held in with a set screw on the arm. The Moki is a different challenge cuz it comes back at a strange angle and doesn't have this set-screw arrangement. The engine is under a small removable hatch so i'll proably end up just keeping this hatch off until i get the needle adjusted, then pop in on before flight.