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"The good you do today will be forgotten tomorrow; do good anyways" ~Abel Muzorewa
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These would allow the player to connect two solid blocks together and push them both with one piston.
To make it more difficult, the clamp will break if one of the blocks is moved to a place the other cannot reach, such as uneven terrain.
My profile picture is from http://www.cachemonet.com, I'm an admin on the Minecraft Fanon Wiki
"The good you do today will be forgotten tomorrow; do good anyways" ~Abel Muzorewa

I'm guessing it would have to be a transparent block that takes up two spaces vertically.