Gene, that was not my idea. Hubcentric wheel spacers come in different designs, most have a second set of studs but some are sandwiched.
Hubcentric and sandwiched has even been tested and approved for legal street use in Europe, the german TUV has about the strictest testing criteria you can imagine, they are so anal it's unreal...and even they approve use of hubcentric sandwiched spacers with the correct (longer and stronger) studs.
I have run 15mm (5/8) sandwiched spacers myself when I lived over there, 135mph was as fast as the little car would go on the Autobahn.... never had a stud break or a wheel fly off....
The only reason spacers have a bad reputation here in the US is all the garbage that can legally be sold here... they should ban these potmetal spacers and fine the companies who sell this junk. There are people who buy this junk and install a 1/4" potmetal disc that is not even parallel, don't use longer studs and instead trust that the two threads that are engaged are good enough to hold the wheel on the axle.... :bullshit: