@rauliruegas , I wish I could say otherwise Raul but I have examined a few recent AT cartridges and their tolerances are just not as tight as they should be. I had one VM 95ML under the scope that had a SRA of 86 degrees which is the worst I have ever seen. Granted it is a less expensive cartridge but it speaks to a corporate mentality. I am also not crazy about some of their designs but that is an opinion a SRA of 86 degree is not an opinion.
@williewonka , I certainly agree that the mirrored protractors make life easier and more accurate. The criteria for setting up cartridges is the same regardless of stylus profile. Lofgren B is Lofgren B. You are either accurate or you are not. Fine line styluses may be more critical in some respects sounding worse if you are not accurate. I have to say that is have seen some amazingly terrible setups with the owner not aware they had a problem. https://i.imgur.com/iVEyDli.jpg Here is a picture of my heavily modified WallyScope. It is showing a cartridge with an azimuth off by 25 degrees. It was noticed when the cartridge started mistracking. The cartridge was replaced under warranty. Every cartridge I buy or setup is carefully examined for defects that might affect performance.