Hi 513 shooter!
like the other guy said 513 triggers, dont lend themselves to tweeking. there was an aftermarket triggerfor sale but i cant remember from what company??? not timney but dayton traister i think. call dayton and ask them about a replacement, and if they dont make one, ask if they know who might.
i,ve had two 513,s great shooters off the bench, but bad trigger shows in off hand position. good luck.
bobbymolson@aol.com