Ground Piston Door v4

This is version four of my Ground Piston Door found here. This version is designed for people with more vertical space than horizontal space. For example, if you play on a SMP server with the Towny plugin and plots are small. The over-all design is only about 1 block thinner on each side but every block counts.

This one uses a T Flip-Flop instead of a monostable circuit because the monostable circuit design ended up using more space and I didn't see a benefit to it. The pistons are powered from below using a torch ladder instead of from the side. Simple change but it required a complete redesign of the wiring.

Version 1: Click Here
Version 2: Click Here
Version 3: Click Here

Additional Notes

Thanks to EnderKhaos for helping make the locking mechanism.