M2 KS15-4: Shutter button got partly “jammed”

[Greenhilltony]

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I recently got an M2 with serial number 1163700, which falls in the range of KS15-4 production and also the eBay seller claimed it to be. I sent it to CLA a few days ago because the curtains/winding mechanism jammed when I was winding to next frame. When I got it back three days ago I put a roll in and start using, everything went fine until today I found that even though my finger has pressed the button all the way down, the shutter still didn’t release! I had to add more pressure without feeling the button went down any further to finally release the shutter. It was about 15-20 frames I have shot at that time. A few frames later the problem suddenly fixed itself and the shutter button worked normally till the end of this roll.

But when I loaded another roll into it, close the bottom plate and cocked the shutter , I had the strange feeling on the button again. I rewound the film and opened the bottom plate. I saw when I pressed the button, the M4 style tulip spool was pushed out simultaneously, and the shutter button travel distance was normal; but if I pressed and held on the tulip spool while pressing the shutter button, it wouldn’t release even when it was fully pressed, just like the case I met earlier. I dropped it to the same technician now and he would investigate into it.