The manual indicates the following:
1) Tighten film with rewind knob, and continue holding it until the shutter is cocked
2) Depress the film rewind button
3) Advance the rapid-wind lever
4) Release shutter for second exposure
5) Waste next frame with a blank.
Just in case anyone else has a Pentax ME, but has no manual, it can be found here:
http://www.cameramanuals.org/pentax_pdf/pentax_me.pdf
I just got my film developed today, I was excited to post my multiple exposures, be it for better or worse. Unfortunately, they are horrendous failures and not even worth posting.
Issues turned out to be:
1) Partial advancing of the film
2) Sometimes, complete advancing of the film for the second exposure. I believe this may be due to advancing the shutter lever (AKA "rapid-wind lever") after pressing the "rewind button", but not continuing to hold the rewind button while doing so. Im not sure though.
3) One frame did successfully plant several exposures on top of one another: however, for this test I was trying to take a frame of my couch with me sitting in various spots on the couch. As such, I also needed the common elements of each exposure to align up perfectly. They did not. There was subtle movement of the film. I believe it could have been subtle movement of the camera, however I "used kid gloves" during the procedure and the camera was on a tripod. Incidentally, for this attempt I taped down the rewind lever with scotch-tape after I tightened the film. This lever will turn anytime the film does, so I figured It would hold the film in place a bit better.
Has anyone ever considered a method of securing a small piece of film inside the camera, as though it were a single frame for a large-format camera? Im not sure how I would makeshift this? Possibly just cut a piece from a roll, put it in the camera in a dark place and then stick some foam or cardboard or something to jam it up against the door? I wouldn't want to impede the operation of or damage the shutter though... Also, I wouldn't know how to transport this rinky-dink piece of film to the lab.
DAZ>> I think your last frame technique might prove to be the best possible method. Thanks.
RKKS08>> I think you were right about HOLDING THE BUTTON while advancing the shutter lever. As I don't have any other trouble with my camera body, I think the reason I had that "extra slack" may have been because of the "film tightening process". Once you let go of that lever I think it will slack off again in a short time.
I bought a new roll, will try again.
On a bit of an aside, does anyone know if the Pentax LX performs double exposures better? One day, I was thinking this might be a nice body to step-up-to.