Adjustable length performance wiggle stick?

Can anyoe reccommend a really good adjustable length tiller extension, is there a carbon version that adjusts? Meter out to meter fifty I guess? Ronstan used to do that 'battle stick' but it was a weighty old piece of work, just wondered if any of the smaller players might have something anyones come across?

 Try catamaran users extensions.  When I had a Prindle cat, some years ago, I used an extending carbon stick, about 10cm diameter. Maybe about 2m long extending to 3 - 3,5m   bullet proof.   Went over , fell on it and it took it well.