GAMBER Quick Adjust Upper Tube Assembly. Upper 12 plate extends equipment to desired position. For DS-LOWER-9 or base with welded pole. Narrative: Gamber-Johnson Quick Adjust Upper Tube Assembly. Inserts into DS Series lower tubes. No tools needed for adjustment. Entire upper section can rotate left and right with a simple twist of a lever. Set collar keeps the tube adjusted to the correct height while rotational adjustment are made. Description: Quick adjust upper tube assembly with 12 top plate. Allows height adjustment of 2-5.25 above lower tube. Use with DS-LOWER-9 or base with welded pole.