Hi all, I need to replace the rear seal on my tdi afn injector pump. iv'e watched all the vids on youtube by dieselgeeks and got the vitton seal kit. I just wanted to know from someone who's gotten "hands on"with this job is there anything else I need to be carefull with other than having the pump in compression? and obviously not scratching the seal seat groove when removing the old one, I just want to be fully informed and not make a balls of it! cheers.:wrench: