if they spin that easily- it sounds like the Ubolt is too large, and not contacing enough ot the frame/crashbar tube . . . .
get/make a smaller ubolt, or use something similar to the Kuryakyn dealio . . . .
"Here is your country. Cherish these natural wonders, cherish the natural resources, cherish the history and romance as a sacred heritage, for your children and your children's children. Do not let selfish men or greedy interests skin your country of its beauty, its riches or its romance.” T.R.