Vinyl engine has lots of printable protractors, and using a few of them to cross reference the results, can be quite useful.
The more common trick is to print the protractor and glue it to a piece of cardboard, for a more functional paper protractor experience.
Also, put some painter's tape on the edge of the protractor, a piece long enough to lock the platter and protractor into position, when it is in the correct spot. This lessens the potential of blowing out a stylus or cantilever.