The hammer or main spring on my grade 2 broke the other day. Heard a crunch and jingle and the right barrel failed to fire. I had several complete locks purchased some time ago via ebay or gunbroker (saw new and old springs at Numrich for 15.00) and swaped them using a needle nose vice grips. Not a complicated job for a novice like me but was told to be carefull with vise grips, gouging, and purchase a spring clamp. Hope this does not happen again but it is inevitable with 100 plus year old guns. Where can I purchase such a clamp or spring vise, is that nomenclature correct? LC locks are simple, engineered so to speak for quick and easy replacement. I am not a gunsmith, nor pretend or aspire so, and would not attempt anything more complicated that a simple swap, but I can see the need for proper tools for field expediency.