butterfly screw

Polaroid snapshots run along the wall just above head height, affixed by butterfly screws.

Ryan removed the collars and slid on some of the heavy discs, then replaced the collars and tightened the butterfly screws.

These two flaws however, can be easily remedied by using an aftermarket exhaust-manifold and by using a suitable adhesive (e.g. Loctite) to secure the butterfly screws.

The other two men carried objects about eight feet in length: one was a boat-hook, the other an H-sectioned steel beam with butterfly screw clamps at one end and a built-in pulley at the other.