This is pica559's template that can extend and retract. I took their template and made a sticky piston as well I will post a picture of my sticky piston when I make it. Credit goes to pica559 for the original template

Link to pica559's piston: http://minecraftpapercraft.com/papercraft/4f1ba04fcb1c433c0400005f/piston

Link to my sticky piston: http://minecraftpapercraft.com/papercraft/501c91729ed6c86977000067/sticky-piston