Quote Originally Posted by markbau View Post
I was allowing for the lens cap. My measurement wasn't exact as I couldn't get the mirror up as I have a roll of film in it. I never have figured out how to fire the shutter without film in the camera even though I've owned it for 20 years, just never needed to!
The best and safest way is to load a dud roll into the 67, or try two empty spools loaded. A slender penny-sized tool is used to tweak the winding mechanism to allow 'dry firing', however, Pentax has never been too keen on dry firing: the camera was not designed for it; that is to say, it will only cock the shutter and initiate the winding mechanism when film is loaded. It is also too easy to damage the shutter curtain or mar the mirror. And old roll of film in it will be a much safer way to examine things.