If we are imagining this correctly, once extended, the arms’ tops are now slotted into the awning tube holes. Only the two arms at the ends are typically needed to hold the awning securely, but you now have a hazard with them at some 45 degrees. Either arm can now be lengthened or shortened by twisting the knob, adjusting the tube length, and retightening the knob. (Actually, these three knobs need to be untightened and the arm levers relaxed even before you attempt to pull the awning tube out from its closed cradle position.) notice now that the arm bases are hinged at the bottom, held in place by cotter pins. If you grasp the ring and pull the pin out, you can now dis-attach the base and reposition each arm out to a 90 degree upright angle, securing the base to the ground with a tent stake. The middle arm can be detached now and used as a post.
By using the arms as posts, you can freely walk beneathe the awning. This setup I’ve found to be more wind resistant than present extension designs, but it takes more time and effort to extend and retract. Which by the way to retract you must open the knobs on the arms, and rotate the small lever at the end of the tube, allowing the spring tension to recoil the awning fabric. But keep tension on that strap in the middle so the recoil does not get away from you.
There should be about a 4 foot rod with a hook on the end. Use the hook end to rotate the small lever at the right of the awning tube into the OPEN position, and insert this same hook into the hoop sewn into the exposed end of the pull down strap, which should be visible at the awning’s center.
After recoiling, make sure your arms are laying flat against the side of the trailer, throw each arm lever up to cradle the awning tube in place, and then tighten the arm knobs.
You can still find parts for this style awning on line. Maybe by talking to a vendor, you might track down an operators manual.
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