2 empy paint cans of differing size
Handfull of rivets
Full drill bit index
Masking tape, 2"
Pen or Pencil
Flatt head screw
Vice-Grip or Channel locks or Line-man pliers
Step 1: Find 2 paint cans
Step 2: Drill vent holes
A. Wrap tape at the top of outer can, and at bottom of inner can. Two layers may be necessary if there is writing underneath tape. Then intent is to have the air move as far as possible inside of chamber, so it would be counter-productive to have holes at same level.
B. Draw a diamond or lattice patter in tape. This will help give you a regular pattern when drilling the holes. Make pattern large enough to retain structural integrity of can.
C. Attach lid and tape in place. (2nd Image)
D. Drill holes.
I used a 6.5mm drill for the holes of both cans and used the same pattern on both cans as well. You may want to use larger, I have not yet tested this and may enlarge my holes as well.
I found that when drilling, I could minimise the jaggies if I slowed the drill before pulling back out of the hole. Its nearly impossible to elimate jaggies, so beware of being pricked.
You could punch the holes instead of drilling, but this would cause extensive deformation of the can.
E. Remove tape after all the holes have been drilled. Remove tape with a waving motion to reduece breakage - making the process easier.
F. Lastly, vacuum all the shavings so you don't track them all over the house. A note: make sure you have a good bag in your vac. If not, you will most certainly cause extensive damage to your vacuum.