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This twin boom wrecker is based on the later versions of the Holmes 750 with the squared off booms. The outside legs can swing out and lower. The twin boom scan raise, lower and swing side to side, the pulleys on top of the main beams also swiveling to match. IMPORTANT TO KNOW: The main round verticals are designed to 'float' in the main bridge assembly. Carefully slp them into place, the bottom first, and use the pully assembly to slip down through the main beam and into the top of the round vertical. It's best if you put a tiny drop of glue in the round vertical top, and avoid any glue to the main beam, so the piece will rotate. Line the pully up with the boom before the glue fully sets. This piece has a couple of very small pins, which I've included extra material for. However, these are exceedingly delicate, and I'd strongly recommend you use wire, brass, metal rod or styrne rod as a replacment for additional strength. Shoulld you have any questions or concerns, contact me vie the designer link or direct via email to firstname.lastname@example.org