Product: TP0701 Mainspring (Original) For Whitneyville Plymouth Rifle Model 1861 & 1861 -64 Springfield Rifle & (Original) For 1873-1889
From: Robert Flowers
Date: Saturday 21 January, 2017
This might be an original (never installed, as opposed to "used") spring. It must be fitted, and is bright polished (after quench hardening) needing final temper prior to use, Temper by placing on a a bare electric stove burner and heat til the spring turns dark straw yellow, remove with needle nose pliars (HOT) and set on aside until cool to the touch. If still too hard to cock, remove up to .1 inch of material on the side away from where it mounts to the lockplate by grinding and dipping in water as it gets too hot to hold. There was a time all parts were final-fitted!