Yes,I agree. But if he is not comfortable taking the side plate off,it’s best to send it to the Mothership.
Some 20 years ago I bought a new model 629 -44mag. In taking off the side plate(standard procedure for my new revolvers) I found an extra trigger spring floating around in the works.
Ya. I didn’t know Smith sent extra parts with their guns!
So I suggested a good oiling with Rem Oil,shoot it,and if the problem persist to send it off. SEE post #24.

Be SAFE and Shoot often!