Now if you want to push the film or if you have 400 film, just take a pair of needlenose pliers and break off a small (1/16 inch square) piece of the cartridge where it fits under the lower right corner of the film gate (looking at the back of the camera).

This won't fool the Pocket Instamatic 20. It seems that tab was originally designed to indicate film is loaded - and it engages the "wind until you get to the perforation" mode.

Does the Orca film have perforations to stop the winding? Or do you have to stop by watching the numbers on the back? Or does it even have numbers on the back?