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An adaptor for accurate mounting of all writing and drawing instruments to a compass.
The Alvin Universal Compass Adapter provides additional functionality and maximum versatility for all Alvin compasses.
961c Beam Compass Coupling W/ Thumb Screw
Replacement nut and clamp for 700S 701S and 702V Speed-Bow compasses and introductory bow compasses 201 and 203.
Chrome finish steel. Packaged and sold in tubes of 12.One end pointed the other end blunt. For No. 891 and No. 893.25mm long x 2mm diameter