I made this:
Robin needs to get her mouse closer to her arm for health reasons, so I shopped for some mouse platforms online. There’s stuff available commercially, but the affordable stuff is terribly unstable-looking, and the solid-looking stuff is ridiculously expensive. So I looked around for some scrap wood, and rigged up this little number over lunch.
It incorporates the remnants of a broken kiddie chair and a never-used conversion kit for a toddler bed. I attached it to the bottom of the armrest with a double-length bolt that replaced one of the original armrest bolts. An hour of time, a few pieces of leftover wood, three bolts, and two washers later, and Robin has a double-articulated, adjustable, and removable mousing platform attached to her chair.
For those of you with professional toolshops in your basement, that’s probably not an impressive achievement, but anyone who knows my general level of handiness will stand in awe. I usually can’t even build a house out of playing cards without it being condemned by the authorities.