Mark goes through the step by step in watch disassembly, cleaning & re-assembly. Very clear and precise instructions & video. Only one thing that made me a bit disappointed is that in only a couple of instructions the work being done was out of camera or blocked by the hand or tool, so I couldn’t see exactly what was being done. I think it’s because it’s very hard to do some work and capture it without hands getting in the way. I must stress that this was only a couple of VERY MINOR moments, and I don’t want this to discourage anyone from proceeding with the course. I just want to be honest and for me personally I was disappointed not to see the exact procedure.