LOL, I feel your pain. I had the same issue. I ended up putting vice grips on the nut under the vehicle and tightened the screw from above. Vice grips didnt spin because i put them on at an angle so they’d wedge against the floor. Might not work in your case though.
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Excellent review! Thanks for posting, your videos no pictures are great. I have been using them for 10+ years and liked the moto cinch tie downs so much I bought the company... thanks again!