Аnyone familiar with Pentax MX mechanics ? I shall be grateful on any advise regarding the following. While I was traveling abroad the shutter button of my Pentax MX fell off, and the camera had to undergo an emergency fix by a film camera technician. Only months later, after a ruined film with multiple exposures I realized that, perhaps in a hurry, he assembled the camera incorrectly. On the underplate there is a button which when pressed disengage the camera film-winding mechanism; it is used to wind back the film, and when taking multiple exposures. And here lies the problem: one can wind back the film without problem, but one can't take double exposures anymore because with the button pressed the film advance sprocket gears still engage when cocking the shutter and the film moves; interestingly, the film is not transported a complete frame, but about half of it (the film that was ruined had all multiple exposures overlapping one another by half). The situation is very unfortunate because I take a lot of multiple exposures thus I can't use the camera (which I love) anymore. Yet it will be very complicated (and expensive) to send the camera back to the same technician because we live quite far apart in different countries and parcels are subjected to various taxes and duties. Does any of you have an idea what in the mechanics could be causing the problem; and how complicated would be to repair it?