Countersinking is used when a flush or countersunk rivet is needed. If the thickness of the metal is .040” or thicker then countersinking is used vs. dimpling (which is for under .040” of metal thickness). A micro-stop countersink is recommended for this process. Setting the countersink to the proper depth is a trial and error process, so the builder will need to test the depth with some scrap metal until the micro-stop countersink achieves the desired depth. Once the desired depth is achieved engage the locking collar to set the depth. When countersinking a block of wood should be used as a backing, with a hole drilled in the center to allow the countersink centering pin free range.
An instructional video on this process can be seen here:
Countersinking Holes
