mods that hopefully work for a TechAge-based pack

mods/mesecons/mesecons_pistons/doc/piston/description.html

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+Pistons are effectors, they push up to 20 blocks in front of them. The push direction can be set by placing them from different angles.
+A piston pointing into an unloaded block won't extend.
+A piston retracting from an unloaded block works, but gravity-sensitive nodes above the empty space may not fall.