scooby2do 0cleeds- read the article above provided by willewonka from soundsmith. It states that they think you should start with the tone arm is to be placed parallel to the record surface. Is that not 90 degrees? ... I have no problem attempting a different method if it can give me better resultsI'm familiar with phono cartridge set up so I'm sorry, but you're confused. A parallel arm will not give you a 90-degree VTA. It should result in your VTA being around 15 to 20 degrees.
I've previously explained what I think is the best approach to phono cartridge alignment. Start with tools that align the actual cantilever/stylus, such as the Mint or WallyTractor devices. Use a VTA gauge to actually measure the VTA. Then, make final adjustments by ear.