Step 1: What You Will Need
Large file (optional)
And electrical tape not pictured
Step 2: Get It Safe (to Cut)
Remove plastic top.
After that Drill a small hole in the top to let the rest out if there is any. To do this use a hole punch and make a divot in the top of the can so the drill bit wont move around.
Step 3: Cutting
Try to keep the cut straight with the can. Try to use a vary fine toothed bladed to keep the metal from getting all torn up.
And like I did put it in a vise but don't smash it just keep it so it does not fall when cutting.
Step 4: Clean the Cut
Then use the small file to get the in side of the can with a out word motion.
repeat about 3 times or till you are satisfied with it.
Step 5: Getting the Cap to Stay On
1.Using the electrical tape place it on the small Shoulder to get a nice tight fit with the cap.
2.Using black electrical tape cover the cut to make it safer. and easy to remove and put on the cap.
Try the cap on it and if it doe snot stay on add more tape.
Step 6: Use It
Or just show it off.