" Last but not least make sure that wherever you take the head knows what they are doing. Usually asking any local Mercedes dealer where they send theirs out to is fairly reliable. Or even an independent mechanic that does a lot of Mercedes. If nothing else they know where not to send them. "

Yes ask the machine shop if they have the tools to remove the prechamber. I asked my dealer last month which machine shop they use and I was told they send all parts requiring machining to the Mercedes shop in Toronto. All of the local machine shops were willing to take my head but after further questioning none had the tools or were willing to purchase them to remove the prechambers. It would have been a waist of time dropping it off had I not asked. Good luck!

__________________
92 e300d2.5t
01 e320
05 cdi
85 chev c10