"The trick comes after the gun is all together except for installing the hammer and the safety (the safety shaft is the hammer pin). At that point, grasp the gun just like you were firing it, holding in the grip safety and pulling the trigger. At that point, the hammer is easy to install and the safety shaft can be inserted to hold it. And you are done."
Sir, you have made assembly of my 1903 a joy. I knew there was a trick and had searched high and low. What used to be a dreaded trip to the dentist for a root canal is now a walk in the park.