A picture might help for those of us outside the .Bene 34s5 sphere. Your budget might also be helpful. Finally, how do you see it being used. Are you wanting to race or just increase your sail trim options. Race boats use the backstay adjuster A LOT!,, like every point of sail, every weather and sea state condition, every headsail type.... all have settings.. so an easy operating, powerful system is a must. The wheel type (which I have on my masthead rigged boat) is very powerful, but is slow to operate. The hydraulic type is very powerful and pretty quick to operate, plus it can be easily preset. The mechanical type, such as the winch handle type mentioned by Ted is interesting, you don't see them that much. On a 35 footer, with a full roach main and a big genoa but NO runners.. you're gonna need a powerful piece of kit. 6 , 8, 10, 12 to one system with dyneema (or wire) in the tackle for example.