When I can get them I like to use carbon fiber arrow shafts and make up my own rods with 4-40 threaded ends. I keep the ends as short as I can and to date have never bent or flexed one. I also make up my own light weight pull/pull systems for the rudder. Weigh almost nothing. With the arrow shafts they are stiff enough you need no added support installed for them if you don't want to add any.