If I had to accomplish a task such as this, I would:
Cut out some of the padding between the butt and knees for the mount, likely about 4-6in before the knee bend. Save this cut out and mod it to be snapped back in place to fill the hole (velcro, magnets, shoulder joints, whatever you like) in case you put your custom mount/arm away for storage and want to retain the original look/feel. For example if you invited Suribusi over and wanted to have an extra chair. :wink:
Mount the arm to the base of the chair at the location of the cut out. It could be just holes in the base to screw it down to an apparatus on the underside. This would also be a good application for shoulder joints, but more care would have to be taken to ensure stability with this route, over screws. You would have the advantage of eaisly switching between pad and mount since they use the same method for attachment.
You could easily sit in the chair without discomforting yourself by a 3 foot object sticking up from between your legs (although if you're like me, then you are already used to it :lol: ). Then when you are all done, you could assemble or disassemble it, even while sitting down in it.
This also gives you the advantage of a wider range of mounting arms since the distance between the base of the mount to where you will most likely be needing it is much shorter/flexible.
-S
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