This is my 1st post EVER, bear with me. New owner of Henry SS, .223. Been reading posts re: triggers/springs. Great info and research by everyone! If you have ever worked with, built or competed with a 1911, you have an official degree in "springology." Marlin lever actions are also a source of info re: hammers, sears and triggers. One of the posts mentions checking trigger/sear relationship outside the receiver. There is no reason an enterprising machinist can't make these pins to fit in the hammer/ trigger holes so the stoning/polishing can be done with no guesswork.
With regards to springs, its a try-and-see job. Take everything apart and check closely for ANY contact/rubbing and polish the living daylights out of it, without taking too much material off! I'm guessing the trigger return spring is a tip-of-the hat to the Marlin lever 'floppy trigger'. Without the hammer cocked you can feel the clicking trigger when pulled and this should be looked into. Since this rifle is so simple, it is fun to 'smith'.
For those who don't wish to modify or tweak these rifles, I would like to suggest dipping/coating the hammer spur with black Flex Seal. It's sticky, doesn't modify the hammer,easily removed and doesn't HURT!
I'll shut up now and let you ponder these ideas. Thanks for everyone's input and info. Bubba, out!