I read somewhere that someone made one of those blocks out of wood. It would probably also be possible to fabricate one out of a piece of plastic, but there are a lot of angles and countersunk holes drilled into it. This is a piece that is going to get brittle over the decades, particularly in planes sitting outside in the sun, like mine. I believe it's worth it to get a new block, because without a good antenna connection, a VOR receiver will be rendered worthless. I know that from experience. And, I think it's a relatively small price to pay to keep a VOR receiver working, considering the price of new avionics....
