OK Douch I take your point I will get a new head and put it on myself. I havn't done this on a L200 before so bear with me if I ask dumb questions. First one if i put a rule on its edge alond the length of the block would this show up any warping. How do you rate Milners heads or do you know of another supplier.
You need to use a decent steel straightedge rather than just a rule, this video shows how, he mentions using a 4 thou feeler which is 0.1 mm.