3/8ths round bar is not much more than wire. if you take a couple of pieces of wood, cut them to app 7 1/2 in dia. attach to table, put stop in place to slide rod into, cut to 3 feet or use full length, wrap steel around wood. travel past starting point; the pieces can be tacked to hold the eight, then cut. cut to size. half inch reduction in dia. (ball park) is for spring back. you can use pipe, sheaves whatever. i would try to do it cold no heat.

8 inch diameter rings can probably be ordered.