I had been having problems when trying to cut pinions, ending up with misshapen leaves as if the cutter was off centre. The centring scope had been used to centre the cutter each time so this was suspect number one. 

A quick search on the web for the maker of my scope, Aubert, revealed they were still in business. They even provide instructions for their current scopes on their website (http://www.marcel-aubert-sa.ch/produkte/anleitung/anl_pdf/anl_mik/m02_mik_111_118.pdf). 

Initial inspection of my scope failed to find the four adjustment screws, Continue reading Aligning the centring microscope →