Thoroughly wash the can, then use a can opener to remove the top, leaving the rolled aluminum ring intact (Figure 19-3). Depending on your can opener, the top may come off more easily if you turn the can opener’s crank backward.
Figure 19-2. Tools and supplies
Figure 19-3. Removing the top
Measure 2 1/2″ down from the can’s shoulder (Figure 19-4), marking this length at several points around the can’s circumference.
Figure 19-4. Marking the ...