It shoudl be very easy to remove.
Unscrew the front screw on the piston arm. On the side of the binding track mounted on the ski there is a single screw located below the heel piece. Unlock this screw by turning to the left, and then pull the screw out. It is a couple of inches long and is just locked in by turnign it a quarter turn after insertion. Pull it all the way out. Now while gently lifting the top of the piston arm slide the enitre bindign asembly it back towards the tail about half inch. The second screw at the piston arm is hidden under the arm and should now have slipped out of a slot in bottom of the arm. Once this screw is clear, you can slide the entire binding assembly off the track by sliding towards the tail of the ski.