Step 1: Build a grating support inside the garbage can
Next, you need to build supports for the grating. Using a 3/8" drill bit, drill three holes approximately 8" below the top of the garbage can, equidistantly placed around the circumference of the can. Then slide three 3" x 3/8" bolts through those holes and secure with a corresponding washer and nut. This will be used to hold the grating up while allowing the grating to be easily removed.