Mark’s attention to detail is like nothing I have ever seen. He tears down every National Optronics machine and then rebuilds it from scratch. After seeing what he did for my National Optronics 6ES edger rebuild, and how little he charged for it, I can only conclude that Mark and his team possess a special form of insanity that they actually love this extremely detail-oriented work. I would highly recommend MH Optical Services to anyone who has high expectations that typical service departments have trouble meeting when refurbishing Optronics machines. He knows these National Optronics machines inside and out.