The stool was pretty tall, but not quite tall enough for that. It needed about 3 more inches for me to type comfortably while seated. Additionally, the tilt of the seat was the reverse of what my back needed. It slanted back, which encourages back-rounding, which makes my sciatic nerve really grumpy. I wanted it to slant forward, which would allow me to keep my spine in a neutral position, slightly arched.
So I decided to remove the seat and jack it up with a stack of 2x4s (2 x 1.5" = 3"). It turned out that the flange holding the seat on was where most of the seat tilt came from, and it looked like it would be easy to reverse since the four screws fastening it were in a square.
Step 1: Materials
Step 2: Remove the seat
Step 3: Get new screws, and a drill bit
Then I looked in the workshop for the right drill bit. I wanted the long bolts to bite into the wood ever so slightly, so I held up a few drill bits next to my long bolts until I found one that was just a tad narrower.
Step 4: Saw some chunks of 2x4
Don't worry, it's only possessed around Halloween.
Step 5: Mark the wood
But approximate is not good enough! I inverted the stool (sans seat) and lined the holes in the flange up with the center lines on my 2x4s. I centered pieces of wood under the flange as best I would, and then marked the holes on the wood with a pen.
Step 6: Drill holes!
Attach the bit to the drill. Reach for your wood that you have NOT put directly on the opposite side of the very sharp but thankfully, not spinning, drill bit. That way you won't gash your hand open and make canida very happy because she gets to patch you up with super glue (tm).
Now that you've avoided that terrible fate, put on your eye protection, fire up the drill, and make some holes!
Step 7: Attach the stack to the flange
Now thread the bolts into the holes using a bolt driver, or pair of pliers, or powerful Cimmerian finger muscles alone. When the bolts get through the first pieces of wood, lift up the whole assembly and put the other two pieces of wood under it, going the other direction. Line the bolt ends up with the holes in those two pieces of wood and keep threading the bolts through.
Step 8: Attach the seat
Ta-da! Now you have a 3" taller stool with a more ergonomic seat tilt!
Step 9: Sitting pretty
I want to especially thank fungus amungus for all his tips and encouragement on this Ible.
I hope you're inspired to hack your furniture today!