Place 2 pistons (sticky/non-sticky) on top of each other, facing up, and then place a block next to the bottom piston with a repeater on top. After that, when you power the repeater with anything, nothing strange will happen. But when you de-power it, the top piston will vanish.
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Duplicate of MC-9460, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
traks