Not sure how they should attach? The Manfrotto video tripod legs (755XB) also have the same 3/8" attachment I think so unless it is female (and it doesn't look to be), am I missing something?

I thought the half bowl itself would have movement to allow me to level my camera without adjusting tripod legs, but it was rigid so I've reboxed it and returning for the flat base fluid head instead. I guess the flat base means a female 3/8" connector?

Only problem then being I need everything ready for Friday!!

Head being returned: http://www.manfrotto.co.uk/lightweight-fluid-video-head-60mm-half-ball Head on the way: http://www.manfrotto.co.uk/lightweight-fluid-video-head-flat-base Tripod: http://www.manfrotto.co.uk/aluminium-tripod-4-section-190