Hi guys I've been having some injector issues with my a4 2.5 tdi Quattro from a lot of reading on here I've decided to take out and clean all the injectors and replace all copper washers so far so good I've 5 of them done but cant get injector no 1 out so ive decided to make a tool to remove it can anyone tell me what size bolt I will need to thread onto the injector ? any help would be greatly appreciated I'll post a pic of the tool when it's made so if anyone else is having the same problem they will be able to replicate it