The awesomeness of the NES Cartridge Clock must be spread all across the lands.
Now, you could go online and buy one... BUT:
1) We all know making your own is more fun than being a consumer whore
2) They take the easy way out and just drill a hole through the whole thing. Less elegant. You'll see.
3) They have limited game selection. Let's face it, Elevator Action just has no demand.
4) This way, you can support your local mom 'n' pop hobby store and/or yard sale.
Let's DO it.
Step 1: Hunting/Gathering Supplies
(1x) Nintendo Entertainment System Game Cartridge of Choice
(1x) Clock Innards*
(1x) AA Battery
(?x) Spray Paints**
(1x) Drop-cloth, newspaper, painting surface, etc.
(2x) Smidges of Tacky Glue
*available inside most (all?) clocks or your local hobby store (Michael's et. al. if necessary). If you don't have a "12" of your own, you'll need one of those too.
**you will need as many colors as you want for the hands and/or numbers.
1) Tiny Screwdriver*
2) Power Drill & 5/16" Bit
3) Hot Knife**
4) Inky Pen
5) Needle Nose Pliers (preferable)***
*most likely flathead
**a rotary cutter would probably be preferable over the drill/hot knife combination. I just don't have one...
***you will need to tighten the clock components, so the smaller your grabby-grippy device is, the better.