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So, question still to be resolved is the nut I lost
I think it's a 5/16 x 18. I have the appropriate nut of that size - it turns maybe two turns by fingers, and then stops dead. I am not comfortable taking a wrench to it. Even the wrench size would be helpful.
Thank you!
You'd really need to provide more info as to the location of the nut you're talking about.
Got a photo of the location?