A few years ago I became interested in David Urwick¡¯s triangular gib key for use on my Unimat vertical column to maintain rotational position when raising or lowering the head.
It has bean a great help to me as rotational position can now be fixed while raising or lowering the head. An example of its use is when a long slot must be cut in a vertical column. I have had this requirement on several occasions and now I have a means of doing just that.
Maybe others can benefit from this also.
Dick
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http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
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OldToolmaker