I have used many types of swingaways. And many ARM types.
I only ever found ONE arm style that was solis and not flexy, and that was the all steel Salsa ones. But not the normal salsa arms that hinge upwards off the seat back as those are also wobbly and weak. Only the so called SINGLE POST REMOVABLE ARMS. Those salsa ones are really good and completely rigid.
The Q chairs are not. All their arms are frankly shit. So I fitted TWO single post lift off uprights to each arm to make the arms rigid. Thats still not as good as the salsa ones. But at least decently solid.
So thats the first part.... NEXT!
As for swingaways, I tried the fully encapsulated ones, the invacare ones, and the paralellogram sunrise ones. All 3 are rubbish. Not rigid enough, and allow the joystick to be flexed in every direction or moved about.
The one in your link is another one that I ordered to look at. I sent that back too. Its got way too much movement in it. Even when tightened up as tight as is practical. The materials are too small or too flexible.
So on the Salsa chair I kept the solid rigid single post arms and then used a crappy wobbly loose feeling stock parallelogram one.
Like this.
- s-l400.jpg (12.78 KiB) Viewed 446 times
But I drilled out all its parallel arm mount holes and reamed them out to allow me to fit the next sized bolt up. As a really tight sliding fit. So that there was non of the free play that the original one had. That, once mounted PROPERLY has no flex, no movment and is about 10x better than any stock swingaway ever was! Albeit considerably stiffer to operate.
Theres a video of that complete with the INBOARD MOUNTING position, and the spacers I used to bring the joystick up to the correct position and height.
In the video martin is forcing the joystick outward hard in a circle. As it rotates you can see the full remaining flex (movement) in the ARM and the SWING AWAY combined. It still moves a fraction. But is a million times better than every other stock chair/swingaway I ever saw. Its the first half of this video.
http://www.wheelchairdriver.com/gopro/JStypes.mp4 On the Q700 R stock encapsulated swing away. But I dismantled it, made a number of internal changes to remove movement (think shims, loctite, and tightening of the belt inside), and also mounted it with some large rubber washers and forced it up under the arm before tightening... Also did the same on the actual joystick end. So 2x arm uprights, modified swingaway.
So in both cases on both these chairs I fine tuned and lightly modified the stock swingaways. Much work for what seems invisible. Until you actually drive the chairs! Then with lively programming you understand why its essential to have rigid arms, and a rigid Joystick mount.