I just helped a friend set up his old Sony TT with an Ortofon 2M Red. Cheap but decent table, cheap but decent cartridge But it took me forever to get the damned thing mounted properly. There's not line or side on it that parallel with anything on the mounting jig I printed out. Doesn't help when you are trying to hold your glasses at just the right spot to be able to focus clearly. Finally I called over my nearsighted wife to use her vision and got something acceptable...
What do you guys do to mount odd shaped cartridges? I had the same problem mounting a Sumiko Blackbird on one of my arms. Usually I get pretty close and line up sides of the cartridge with the lines on the jig, but when nothing is parallel, I simply backed away and tried to align from a bit of distance. Any ideas?