While replacing wheel studs yesterday on the front of my 370, i noticed a small bolt and metal spacer tube approx 1/2" long thats threaded to the rotor, goes into the rotor, maybe 2 full turns. just in 1 spot inbetween two of the lug holes. It sits there by itself, i'm curious to know what this is for, is it balance, alignment of the wheel to the rotor.?
Appreciate any feedback..
