trying to locat where i can find this 'fork' bow/tack fitting as shown on the laurie smart photos in gallery (also on the shiny green keith callaghan hazardous at the dinghy show). 
Anyone know the manufacturer? closest i can find is a tiller swivel fitting but that looks a little 'light'
https://www.merlinrocket.co.uk/index.asp?selection=Gallery&dphot=1220
https://www.merlinrocket.co.uk/index.asp?selection=Gallery&dphot=1380