We have a very old model on our boat
. It works well but ive had to do several mods to get it up to par. The course setter I mounted on the unit itself just next to the hole where the lines come out. It's a little challenging to get the slack out of control lines so I use a small wood wedge to tension the lines so air paddle doesn't pivot. A big improvement has been larger air paddle made of box section acrylic
board(similar to monitor
light air paddle). Another upgrade have been a threaded stainless insert on the bronze
shaft fitting where I can screw in a small tiller to use with a tillerpilot. I had some play on the ratio adjustment where the pin rides between the two fingers. I used a Teflon bushing which helped correction sensitivity. The newer units are much beefier and improved but our has worked just fine.