Why the need for the metal plate?

I recognize the use for the pivot bolt and positioning of the wheel.

But to achieve the locked down position, could you not also drill a hole through the 2x4 arm as well as the frame and put a bolt through to lock them in sync?

We use the bolt method for our milking stanchion and I am wondering if we can improve with the metal plate.

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Discussion

Yes, putting a bolt or pin through would lock it just as well (more securely, actually - every once in a while one of the arms will bump something or get caught on a rough bit of ground and pop out of the catch). A bolt was going to be my first design, actually, but then I thought of doing it this way. The primary advantage of this is I don't have to bend down to put a pin in. I can just step on the arm, which lifts the tractor, and push the catch plate over just a bit to latch it under the lag bolt. Move the tractor, and use your foot the same way to unlatch it and set it back down. That's why there's an extra chunk of wood attached to the front of the arm, to give more area to step on.