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The auto-locking pin is home built. Starting with a ¥ö bolt. I welded a ring on top and drilled a small hole on the side of the shank. The bolt slips in and the spring is held with a cotter pin (on the bottom of the spring) so it is always trying to push the bolt down. As the swing-arm is opened and aligns with the hole in the bumper, the bolt drops down and locks the swing-arm open. Lift up on the bolt and swing the arm when closing


The genius in this is the simplicity. All around, the best multi-use bumper I've ever seen.

85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!