Adams' countersink is adjustable by loosening a screw and
rotating a threaded collar to advance the cutter and give it a
ranker cut. Examples of this countersink are moderately scarce
so if you see one in the wild, latch onto it because they are a
pleasure to use.
This photo shows two versions of Adams' Countersink. The one on
the right is probably the earliest since when it was made it was
marked Patent Pending. The one on the left is imprinted with the
This photo shows the adjustable cutting heads of Adams' Patent.
This is a view of the back of Adams' Patent
James E. Price
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