I just bought a Schneider Super Angulon 65mm f/8 with a Synchro Compur shutter. It has speeds from 1/500 to 1 sec including B (no T). It also has a little green lever with a V, X, and M setting. I cannot seem to get it to move to the M setting and it will only stay in V if I hold it there.

How do I keep the shutter open for focusing?