I have an STD 305M and an SME series 3 tonearm.
Attached is a photo of an STD M with an SME series 3 arm, both just
like mine.
I have two protractors, one an SME and the other is a "cart align",
and each is so far off that mounting the arm base would require me
to glue the arm base rather than the normal mounting.
Need help in finding the correct protractor to mount the arm.