if u ever lose that spring..
a local cowboy shooter modified my sixguns,and said he takes the spring out of BIC lighters,and cuts them a skosh longer than the depth of the hole with the pin inserted.one spring makes several of these hand springs.
He makees the pins out of a piece of drill rod and rounds the inward end a tad.
btw,i'm sure that 'tad' and 'skoshe' are real gunsmith terms,lol
this conversion made my old 'clunker' sixgun a lot smoother,there was too much tension on the original hand,AND the old flat hand springs are very prone to breakage.