Doubtlessly this is the most anticipated product by all of our F1A customers- timer winding key. It took us a while to produce this essential tool, but it was worth the wait- the solid aluminum one-piece machined key perfectly fits the standard W-Hobby timer disk and will help you to wind-up the timer much faster and position the disk more accurately. Now you can be sure that your timer is fully wound before every flight, and this time it's painless!