David, welcome to the forum.

That particular spring is found only in the first and second model Ladysmiths. The third model had a different trigger return system. Your Ladysmith is a second model.

If you plan to fire your interesting revolver after repairing it, be sure that you NEVER fire .22 Long Rifle cartridges in it. They can rupture the breech end of the barrel. Most of us who shoot these guns use only very low power rounds like CB caps.

__________________
David Wilson