Jouk - Thanks, but does the pin not stop the ball swivelling - surely it will only travel in 180 degree plane instead of 360.Mike
The shipping costs are a big rip off on these things though, i was going to order three from another site.
Thanks Tony that's the site i was looking at (i think you posted it on here). They are so cheap and light that the postage for half a dozen shouldn't be more than about three quid!