Hello guys, I would like to change the two head seals from my landlord’s car (Audi 100/A6 2.6 V6 ABC) in about 3 weeks. I also want to overtake the head a little bit, which means valve shaft seals new and regrind valves. Now I have changed a head with a Fiat but never disassembled the valve drive. I read everything and understood everything except the following things: 1. In order to take the cam shaft out I have to logically the NW This is only on a cone without locking. In the instructions it is always quite natural to take it off. But don’t I have to make it before as it was on the NW???? Otherwise I will never get the steering times right again after that or is it enough to make it like the cams at OT were? 2. The writing that one should use a shock puller for the expansion of the shaft seals because these are very tight. This also goes out with a screwdriver or the like. 3. For the assembly of the new ones they say you should take an imprinter. In addition, the same question, do you need it or can you do it without it?