OP,
After that little trip down the rabbit hole courtesy of Raul, maybe we can get back to your topic.
I use the Acoustical Systems SMARTractor, (https://www.arche-headshell.de/alignment-tools/smartractor/)which is similar to the Dr. Feickert protractor. The difference between these tools and a paper protractor is not the accuracy, but the ability to perform your alignment in a more accurate way. IMO these protractors allow you to see the alignment better, and because of that you can achieve better precision.
The Mint protractor, which I have also used, is designed to be used for a particular brand and model of tonearm. If you have different tonearms you need a different protractor for each different tonearm. A great tool if you only have or will have one tonearm.
I also have an alignment block similar to the one referenced by rsf507. IMO also a great tool and worth owning.
Best Regards,
Jim Perry
After that little trip down the rabbit hole courtesy of Raul, maybe we can get back to your topic.
I use the Acoustical Systems SMARTractor, (https://www.arche-headshell.de/alignment-tools/smartractor/)which is similar to the Dr. Feickert protractor. The difference between these tools and a paper protractor is not the accuracy, but the ability to perform your alignment in a more accurate way. IMO these protractors allow you to see the alignment better, and because of that you can achieve better precision.
The Mint protractor, which I have also used, is designed to be used for a particular brand and model of tonearm. If you have different tonearms you need a different protractor for each different tonearm. A great tool if you only have or will have one tonearm.
I also have an alignment block similar to the one referenced by rsf507. IMO also a great tool and worth owning.
Best Regards,
Jim Perry