I cannot get the back cover to snap back on after replacing the battery. I have the national geographic micro light carabiner watch

SOURCE: watch battery replacement

I have a Timex Expedition Indigo with a metal case. Not sure of the exact model number but on the back there an M6 below Expedition. Anyway, I had the same problem of snapping the back back on. I found a "battery" website that had some suggestions that should be typical of any snap back case watch. http://www.online-batteries.co.uk/whichbattery.shtml specifically they said that when you try to press the back on it must be flat (not one edge down as I had been trying) Put the watch face down on a non scratch surface and press with both thumbs evenly. If that doesn't work a press will be needed. If you have a vice a couple of blocks of wood to distribute the load on the front and back may work, otherwise take it to a jeweler with the proper equipment. The thumb routine didn't work for me. I have a vice but figured many wouldn't so I tried something else first. I put the watch face down on a piece of wood. I found a small 2" long scrap of wood (3/4" x 1.5" approx) that spanned the back. I centered the back (aligned properly) placed the block of wood squarely and centered across the back and tapped the end of the block with a hammer. First try didn't work, second one did. I used a rubber mallet as the hammer but a regular hammer or other heavy object would work. The trick, I think, is to get everything lined up and square so the blow is centered and even. Also, I'd suggest cleaning the back and the groove in the case and be sure the rubber gasket is properly positioned. This will give you the best chance of retaining the waterproofing. And remember to check that the watch is running before you do this. Some need to be reset (usually with a very small screwdriver or pin) after replacing the battery. There should be a small hole with some printing next to it. You may need a magnifying glass to see/read it. Good Luck, Richard

SOURCE: HELP !! can't snap armitron watch cover back on

Take a small thin piece of cloth or paper towel, fold it and use to cover the watch face.  Put one quarter (coin) on top and one quarter (coin) on the bottom.  Place the sandwich in a pair of pliers, center thhe pliers and press, when you hear the snap, the back is on.  Do not use on a watch with a domed crystal, or at least use a lot more padding over the face.  Takes 10 seconds.

SOURCE: How to set time on my National Geographic Dakota Atomic Watch?

For the national geographic radio controled watch.
The easiest way to rest this watch is to remove the battery.
Once replaced the watch will flash set to 12. Push and hold the upper button till the hands spin. Press this button again to stop the hands. Tapping the upper button will make the hands move forword 1 sec. Set all the hands to 12. becareful, if you pass 12 you will have to go around again. to start the hands spinning again press and hold the upper button untill the hands move. Once all the hands are at 12, press the lower button and the screen should flas LON for london. Set the city code using the upper button to your area. press the lower button hard to confirm the information. The watch should set itself to the correct time. If it starts running from 12, place it on the window sill for the night so that it can get a signal.

SOURCE: dakota atomic wrist watch sold by National geographic

s1 is the top button and s2 is the bottem button