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I check my king pin caster with a protractor. I use a sliding T bevel to measure the angle of the king pin caster against a level floor. I then measure the set angle found on the sliding T bevel against my protractor. I have hand built front axles for our antique cars and I have tried different caster angles. For easy steering and having the wheels easily returning to the front after a corner, 5 degrees is a good caster angle. The 1911 Stanley pictured I scratch built starting with just the engine. In setting the caster angle, set the sliding T bevel to 5 degrees and then bend the Model A axle to match.