I was finally sick of hearing about every damn pound my wife gained or lost, so I endeavored to ruin her weight obsession while still allowing her to observe general gain and loss (that's called "compromise" kids!).
YOU WILL NEED:
Decent needlenose pliers
Glue or tape
String or fishing line
Downloadable file to print:
STEP 1) Get an old school dial bathroom scale. I got mine at Goodwill, but they still sell them in actual stores where old people might shop. The one I purchased is a Sunbeam Easy Read Dial Scale, model SAB700. amzn.com/B003081WWE There's newer versions of this scale and I have no idea what they look like inside nor how to take them appart, but I wouldn't be surprised if they were exactly the same. Buy based on your ability to improvise.
STEP 2) To open the scale flip it on its back. You'll see two springs hooked onto the bottom of the scale through two holes. Use needlenose pliers with a GOOD GRIP to pull the spring hooks off their mount. It's a pretty strong spring so get a firm grip on it or you'll punch yourself in the face with your pliers.
STEP 3) Put a bandaid where you punched yourself in the face with your pliers.
STEP 4) Remove the original dial (screw in the center) and flip it over.
STEP 5) Tape/glue your new dial on the back of the original dial and put the dial back in place. Keep in mind that it doesn't much matter how the new dial lines up.
STEP 6) Put it all back together. Interestingly it took me a few to figure out how to get those two heavy springs connected back up. The hole is too small for my pliers to reach
Not sure what kind of interesting specialized tool they must have used at the factory.