Fitted one of the mocal oil cooler kits and now when I tighten up the oil filter it hits against the hexagon on one of the hose adaptors that screws into the sandwich plate. The only way to stop it touching is to slacken off the adaptor so that the flat part of the hex sits parallel to the face of the filter rather than one of the pointed parts of the hex where the two flats meet (if that makes sense?), but that obviously means the adaptor isn't tightened up properly.
Anyone else had this problem? Anything I can do about it?

 

I assume you have now made/had made your oil hoses, that being the case you can file a flat on the corner that hits the filter, another option is to get some/a different connector that has a collar section first 1" or so, so the hex tightening bit is further up/away from the sandwich plate.
Failing that you can always use a double female adaptor to move it away a bit, this will have a much much smaller hex around the centre.
They're(sandwich plates) not very well thought out at all really are they!!
tabetha

 

Could try a dowty washer once tightend the fitting may end up in the right place.

 

PTFE tape the threads and redo.