D8 Injector removal and refitting

[gumby6371]

I 'carefully' cleaned all the gunk from around my injectors to identify a fuel leak and it now looks like it's spraying up from the base of the injector, far left (fuel pump side), I'm guessing (hoping) it just needs a new washer as it's not sealing properly. Has anyone removed/refitted one of these in a D8 and is there anything I need to look out for ?