Maybe I'm being dim here Richard - but I don't get the point that you are making with the counterbore. How o you propose using it in relation to Tom's idea of creating a wedge shaped washer?
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The end is flat. If the pivot hole is the same size as the centering pilot, the device may be held at some angle to the scale and thereby make a controlled ramp angle on which to set a normal washer. Best to have the scale in plasticine at the correct angle and use a pillar drill. Or best, even, turned by hand while held in a chuck.
~Richard
I see what your sayin, thats similar to how i did my torrey geezerAttachment 199976
But i counter sunk the micro screws and washers. Two between the tang and scales.Attachment 199977