More creative juices flowing this weekend. I sat down and created multiple spinners. This one uses (3) 1/2" nuts and one 608 bearing.
I designed this one to be 9mm high which allows the 1/2" nut to stick up about 2mm. The 608 bearing is only 7mm high so you can recess it by hand once you get your covers on. You can shove/hammer the 1/2" nut in 1mm if it really bothers you.