This scale requires a single compression spring to measure up to 200 grams. From my testing, the margins are only ~2g, less than 5%. Only the specified spring will work with this scale. No other hardware is needed, all snap-fit.
The spring is specifically sold in Maker's Supply:
0.6x12x70mm Helical Compression Spring - BB001
Notes:
Use the screw to calibrate the scale to 0g.
To take it apart, carefully pull up on the hook, the front plate should detach.