This is my color combo lock. To use it, simply press the button next to a color in the combination to change it. There is an easily accessible output and it is infinitely stackable. There are 4 put together in the current design making for over 65,000 combinations (16^4) and each additional piece increases the power by 1. It is very compact at only 3 wide. To change the combination, simply change to the colors that you want and move the glass block in the second piston tape in front of the repeater. Diamond/comment/subscribe if you like it :).