Well I have always gone cheap and simple. I used a ¾” weld on adapter from the local stock car mail order place (Capital Motorsports) and a cheap stock car wheel. I believe a weld on adapter is legal. Some disagree. A little bit of work with a grinder is needed to reduce the shaft diameter. If you do a weld on drape the column with wet rags, otherwise you will melt the plastic pin that allows the column to collapse. It is not the end of the world but it can be a little annoying to have it slide in and out.