https://cimg5.ibsrv.net/gimg/passionford.com-vbulletin/2000x1124/80-20150517_130843_2c8030b998da83e09971ce89b1a82b4d48 07e760.jpg
That picture is wrong !!
You cannot have it like that .
Either prop locates in donut and on the gearbox as per hexagonal one
Or
Prop locates back of gearbox with the circular donut around it as per escort cosworth