I did the cv boots on my daughters Punto the other day. From the "top tips" in the haynes manual I made a tool to jam the hub, like the wooden tool above but from some thick steel strip. Around 800mm long. An additional 200mm length is fastened with a bolt. The pivot point is 200mm back from the end of the 800mm length. The result is a bar with an adjustable V at the end. Fasten the ends on 2 opposite studs and fit the nuts. Works for any PCD so useful for many applications