The lens you have is in shutter CN-1210-051. The single page for it is a further in the manual. It is a single page covering the speed dial and aperture lever assemblies. All other repairs, adjustment, lubrication is covered by the CN-1110-000 as the CN-1210-051 is a variation of the CN-1110-000. Your M-X will not have the self timer delay of the M-X-V version. If you click on the Compur Repair Manual at the top of the link I previously posted it will open to a page that has each section sub linked making it easier to find pages you need. Near the end of section 3 Tables of camera/lens/shutter/mount is where you will find your shutter listed under Schnider lens if you want to verify this. Compur only made a few shutters and adapted them to many applications.
The retainer ring set screw is close to the size of an eyeglass frame screw so don't loose it when removing it. To get access to the retainer unscrew the front lens element.
A leaf shutter blades and operator ring float in the shutter housing. Setting the shutter only puts pressure on the main spring and positions the release lever so that it will operate the lockout for the shutter blade operator. The operator has a moderately weak spring that will throw the blades wide open with nothing obstructing it. The main setting spring will force the blades closed quickly if nothing restrains it. The delay gearing regulates the closing by preventing the main setting spring tension being applied to the blade operator for the marked speed. The fastest this works is 1/125 second. To obtain higher speeds a booster spring is added to the mechanism and is compressed when the speed dial is turned to speeds above 1/125 with the top shutter speed compressing the booster spring to its maximum. This is why a shutter speed dial gets harder to turn at the fastest speed. Normal operation.
Many times after assembling a shutter with this type of front plate retainer system and verifying the shutters operation the retainer ring has to be loosened after the shutter has sat idle for a day or two. The retainer ring will be in near alignment at one of the other screw positions so only back it off enough for the next possible position to come into alignment. Continue until the shutter operates correctly consistently. Some shutters run slow if the retainer ring is over tightened. A 6° turn (1 minute on a clock face) can make the difference between working and failing.