If you are still interested ………..?
Just to clarify, the retaining washer is secured to the indexing plate only, by the three screws . This sub-assembly is located by the "key" on the retaining washer to the spindle, which has been machined with a matching notch. The whole is in turn then secured to the spindle by the central retaining screw. In this manner the indexing plate can be either rotated independently of the 10° division plate, or the two locked together by the detent screws.
John
Edited By John Hinkley on 29/12/2020 09:23:14