After cleaning up O.D. on the lathe and re-opening the slot of the kicker return spring. I stress-relieved the weld by bringing it up to just a light straw color with the torch and cooling it slowly. While I don’t believe I reached critical temp and weakened the part, my knowledge of heat treating and tempering is minimal at best. I generally harden and quench parts and half-ass temper them as I don’t have an ash box or treating oven.