Hello there, anyone could tell me is it important lock & using TDC before remove the head bolt or remove the camshaft?as the link i show here http://www.pelicanparts.com/bmw/techarticles/101-Projects-17-Head-Gasket/101-Projects-17-Head-Gasket.htmat figure 4 (Locking Tools) at the picture and figure 35 (TDC)also its a non vanos engine..im having a D.I.Y project here so hope anyone could tell me about it..thanks..