OK. the link here to keyboards is probably even more tenuous than my bluetooth scale but whatever. In the quest to relieve perpetually tense forearms due to bouldering + heavy keyboard usage I came up with this massager using easily obtained components. The total parts list with estimated price: (all items except for skateboard wheels were obtained at Lowe's)
4 skateboard wheels with bearings: $10 at target, but you can easily wind up spending far more for fancier wheels like the 70mm kryptonics wheels in most of these pictures.
2 4" wood clamps: 2@ $4.99 ea. = $9.98
2 5/16" x 8" machine bolts: 2@ $1.15 = $2.30
3 11"x1/4" threaded rods: 3@ $0.97 = $2.91
8 plastic spacers: 4 x (2 @ $1.09)= $4.36
2 pieces of thicker(1.5"x1.5"x8") wood: ? this was just scrap wood I had lying around, not sure how much it would cost.
(optional) 1 piece thinner wood (0.75"x1.5"x8") also scrap wood and not really necessary, just added to allow clamping in one other place.
4 pieces of 1/4" thick ABS plastic: ? scrap plastic I had lying around, not sure how much it would cost but small sheets of lexan or acrylic at Lowe's are pretty cheap.
Assembly:
Putting things together is pretty easy: thread one wheel onto one of the 8" bolts, followed by 2 plastic spacers.
Next, add another wheel followed by two more spacers and a piece of ABS plastic.
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