I would come nearer thinking the sear spring is what broke. The trigger itself doesn't normally have a return spring, being returned by the sear. If the trigger has a spring at all it is normally very light & pushes the trigger to the rear to keep it against the sear leg without slop. I have never owned a Lwis, only Crass & Flues but this is a common set-up.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra