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 HA5512 is used by Finn, 470, 420, RS400, Laser 1, Laser 2, RS Feva, and Solo sailors and is 4' (1200m) long and 147.1 grams.