Technical : Correct fuel filter

Job done. But b!"£$%y h$%l was it tight. I was afraid that I would round the corners off even with the hex socket, so I filled the plastic hexagon with 2part car body filler to make it a solid lump and it worked. 

Re the filling of the filter with diesel no problem, Just left the diesel lines off took out the bleed vent all together, got a washing machine measuring cup and gently filled it through the vent hole until no more would go in. Put back the lines and started the engine took it for a spin all AOK

I can send you some pics but I think you have a practical sense like myself and can put 2 and 2 together. So once again thanks for your help. I would have been reluctant to put that much pressure on the tool

Kind regards