As long as your tonearm was mounted correctly with the pivot to spindle distance right on the Baerwald protractor will do just fine. You have to align the cantilever arm perfectly parallel to the lines not the cartridge body, with the stylus right on the cross. With good light you get right in front of the cartridge with your nose almost on the platter and line that cantilever right up
petg60 is referring to the DB Systems protractor. It is an excellent protractor for very little money, $45 I think. Spending more than that is IMHO a waste of money. The single greatest source of error is the operator. Not the protractor. You have to take a deep breath, get your fastidious hat on and tweak that cartridge into position. You have to leave the screws just loose enough so you can move the cartridge with just a little resistance. Once you have the cartridge in position you tighten each screw just a little at a time going back and forth until they are just snug. The result of overtightening is total looseness!
petg60 is referring to the DB Systems protractor. It is an excellent protractor for very little money, $45 I think. Spending more than that is IMHO a waste of money. The single greatest source of error is the operator. Not the protractor. You have to take a deep breath, get your fastidious hat on and tweak that cartridge into position. You have to leave the screws just loose enough so you can move the cartridge with just a little resistance. Once you have the cartridge in position you tighten each screw just a little at a time going back and forth until they are just snug. The result of overtightening is total looseness!