Safe to use Wheel Adapters 5 on 4" to 4.5"?

studs on the rear axles , i went from 7/16s studs to threading the hole in the axle to 1/2-20 screwed bolts in from the rear of the axle . never a stud problem . in fact thats the thread i used to bolt those adapters i made on . countersink in and out . it work for the time i need it too , back in the late 70's early 80's .