Drill Jigs – Principles of Design – Examples From Practice- Dimensions of Jig Bushing, Third Edition, Machinery’s Reference Book No. 3, originally published by The Industrial Press, New York, NY, 1913. Reprinted by Nation Builder Books, Leesburg, VA, 2005, 5 1/2 x 8 1/2 softcover, 56 pages.
Used ( Very Good Condition ) SOMMA TOOL Model RT-401 Precision TAP Holder Bushing Set # 0 thur 1/2" Taps UNIQUE DESIGN -- Bushing grips the tap around three-quarters of its circumference, and fits the hole in the floating holder in the same manner. Result? More accurate fitting and line-up of tap and bushing.
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