What I'm trying to make is a one-way piston.
When I start the level, it needs to be inactive, then a switch is pulled and it travels the full maxiumum distance and then stops permanently.
Perhaps I should exlplain what I'm trying to do, I just need a piston to launch the entrance over to the end and stay there after I enter the level.
I've tried various things but I can't get it to work correctly, It's probably an easy fix 








