I've replaced several PODs on GSNs, GTNs and MG-1s, and it's been my experience that I don't want to try it from the front again. I have two GSN's in a box for parts due to the facts that I attempted to open up the front of the camera to replace the POD. I know that many people had done it successfully, but I haven't, ever! I might suggest that if you remove the top to try it, also remove the bottom - I've had a POD fall into the camera, and after a bit, it dropped out through the bottom. A can of pressurized air will also help blow out any debris which may fall into the camera body when removing the old pad.
I took a fine jewlers screwdriver [you can pick up a whole set for a buck at a dollar store] and bent the blade at about a 45 degree angle to scrape the old pad away. Then when your ready to replace the old pad, take a safety pin and bent it so that you can slip the pad under the shutter pressure plate, the part that goes down when you press down on the shutter. You can see it when the top is removed.
I'd be hesitant about using super glue, cause it dries so fast. I use something like contact cement; it's a little better cause it gives you time to move the new POD into it's proper position, and once you take pressure off the shutter button the shutter pressure plate will return to it's upward position and hold the POD in place till the contact cement [or something similar] dries.
It really sounds more complicated than it is. Good luck - a new POD will make a world of difference in your camera's operation. One of my Yashica MG-1 cameras stayed open in dim light, but now with a new POD it works as it was designed to do.
