I have a right-side shifter (ST-MC11) that I need help with. I've never worked on shifters before, but it wasn't working at all, so I figured I couldn't screw it up anymore.

I took it apart, messed around with it, and put it back together. Now, it shifts from 4 to 7. Better than before, but I have NO CLUE what else to do!

Are there any tips/tricks? Or, is it time to buy a replacement?