Has anyone modified a Widden V-Block made for the staggerfeed mags to work with a centerfeed gun? It looks like the Whidden V-Blocks are not made for the centerfeed guns--unless I'm wrong about that. I'm not sure if I'd just have to mill out the magazine hole on the V-Block to work with the centerfeed blind mag or what I'd need to do to fit it. Anyone using this block in their savage centerfeed?