The way you put together (I assume you’re interested in the wheel) is as follows, looking at the mouse from the above, buttons at the top.

- The spring that’s spooled up goes to the right side of the wheel, the spring that’s a bit more curvy goes to the left side of the wheel.

- Try to assemble the plastic piece with the wheel - they should look as Step3 / Pic1.

- Put it back into the housing, to give you a guidance how it should look like.

- Take it out and disassemble.

- Add the left spring with its rectangle corner, one end of it to the wheel holder, for the other end there is a small hole on the left part of the plastic piece.

- Add the wheel. Try to roll it, you should hear the usual clicking voice.

- Put the right spring to the right side of the wheel, to the rod.

- Put the assembly back into the housing. Try to click the wheel - the right spring should bounce it back.

Hope this helps.