Oldham's still in business and selling the trailer hitch jig and spinnerbait. Here is a link to his site:http://www.oldhamjigs.com/
I still use their stuff, for the most part, GREAT JIGS and good spinnerbaits. I NORMALLY order spinnerbaits off of S.O.B. spinnerbaits, however. Hope this helps. Tight lines, keep safe and good luck. They have the screwlock jigs in 1/4, 3/8, 1/2, 5/8, 3/4 and 1 oz sizes, I believe.