So I am picking up a Winchester 1897 takedown from 1922 with a bad main/hammer spring tomorrow. I technically have all the parts for a Norinco clone I could swap into the shotgun, but I'd prefer to keep it as original as possible. The spring looks pretty easy to source, but I'm going off the current owner as I have yet to lay eyes on it. How difficult is replacing that spring? Any tricks or tips to it?