This is probably the Holt Allen dinghy tiller extension that you need. Holt Allen's Fixed Length Lightning Sticks are stiff and lightweight. Their stiffness comes from their 19mm O/D tube. This larger diameter tube is more comfortable and easier to grip even in cold and harsh conditions. Lightning Stick put you firmly in control and give a responsive feel to the helm.
The HA5514 is used by RS 400 (long) Merlin Rocket, and International Moth sailors and is 4' 10 in. (1400m) long and 163.5 grams.