If...
..you pull on the line that runs up the front of the pole and it moves, then the counter weight is moving feely. The problem then is the clamp on the pole that secures the table. Instead of trying to move the table up and down, try rotating it. You will have more leverage this way. After you break it loose, wax the entire length of the pole to avoid this in the future.PS to avoid having the counter weight knocking on the inside, drill and tap a hole in the pole just below the table in the normal position. Then thread a thumb screw into the hole to scure the counter weight. To lower the table, just remove the thumb screw.