Here was my solution: Monsterbolts. Simple allen wrenches, washers, and metric allen bolts. Just JB Welded them all together and shot them with a little spray paint. Way back when Mule was making his Mule Nuts it got a lot of us thinking of our own way to solve the solution. Props to Mule for the original idea WAY back when! Wish the archived site still had pictures and could be searched.