I have a Kurt swivel base for my 5" Kurt vise that I would like to use, but I need the nuts that mount the vise to the swivel base. It looks like I can buy them for about $50, and I am willing to pay. I was just wondering if there was a cheaper alternative. I don't mind machining something, but these don't look like ordinary t-nuts. In fact, Kurt lists them as "special nuts". They definitely look special, and not something I want to make if I can get them for $50. I just want to know if there is a cheaper alternative. Any recommendations?