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Thank you, great idea for the rattle solution. I kinda figured it was a support of some kind just couldn’t figure out why it was left loose on both ends and why it wasn’t actually snug or even close to the bottom of the floor board. I guess it allows for the frame to flex?🤷♂️Just floorboard support.
Some have said it is a source of rattling at certain RPMs.
I have a similar rattling and never looked into it yet. I bet that's it.
I would recommend trying to better secure it from movement while you have it apart.