Well, when you're using SPU cartridges all you have to check is Pivot to Spindle on your tonearm. You don't have to adjust SPU type of cartridges, you have to adjust tonearm PS distance only. For example: on FR tonearms SPU will be spot on with Stevenson alignment, with modern tonearm it will be spot on with Baerwald alignment, depends on tonearm design (geometry).
For conventional cartridge all you have to do is to buy nice headshell with slots (if other type of shell without slot is not accurate with your cartridge/tonearm). Some sheadshell without lots designed for specific tonearm from the same brand.
For conventional cartridge all you have to do is to buy nice headshell with slots (if other type of shell without slot is not accurate with your cartridge/tonearm). Some sheadshell without lots designed for specific tonearm from the same brand.