From my perspective, I'd rather have a short needle valve to adjust that is angled slightly back from the prop. No need for long extensions. Long extensions just get your hand out toward the outside of the prop, where the blade speed is much higher. Closer to the center, lower velocity, fatter curve on the prop, less hazard. Check it at the beginning of the day, and good to go. You can make it complicated and add additional parts, but sometimes its better to just keep it as simple as possible.

Brad