Originally posted by Mrelia Now, the film only advances a partial frame per exposure so the only way to use it is to cover the lens and click+advance several times. The amount of slippage is not consistent. So sometimes it will advance a full frame, sometimes a half, sometimes less.
It is possible that there may be damaged or stripped cogs in the winding mechanism. Apparently Spotmatics were a repair techies dream so if you are so inclined, you may be able to repair it. Thomas Tomosy, in the 90's, put out some repair manuals: "Camera Maintenace & Repair" in 2 volumes. There are fairly generic but do include Pentax film models. They may be available through Amherst Media or a really good library.Good luck.