This will take off your adapter without mounting the lens. Ideally you want to use the correct adapter for your camera and lens combination, so the correct frameline automatically comes up when you bayonet the lens on. In practice it's a bit of a pain, but quite workable if you have only one adapter and a lot of screw mount lenses. The earlier M3 and M2 show three framelines. The later M4-P and M6 double up each of the three frameline displays to show six framelines.
Earlier cameras have slightly different framelines.
You need the three adapter set for all three frameline options on your camera, IF you want the frameline to automatically pop up for a selection of lenses. They are a number of variations. They are also labeled for their particular frameline. Earlier adapters made for the M3 might be labeled only 50 or 90 or 135. I use both, and haven't been able to tell the difference in practice.