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I believe what you are referring to is the trailering leg, Honda calls them tilt stoppers. It is held into the large swivel bracket by a small split pin. If you can pull it out the pin is missing or rusted. You can get a new pin from your Honda dealer or an auto parts store. Get a stainless steel one and take in the part to get the right size.
The "horseshoe" thing is a "c" clip. The spring goes on the tilt lever.
Can you give me the complete model number of the engine to further ID the parts?