To describe the interplay of the trigger, trigger lever and sear bar that takes place when one pulls the trigger on a luger would get rather wordy (if I tried to do it). It may help to watch the animation on the home page of this forum and try to see the sequence of :
1) Trigger pulls back.
2) Trigger lever pushes inward on forward end of sear bar.
3) Back end of sear bar rotates "outward" and releases firing pin.
Personally, I have noticed a wide variation of trigger pulls on lugers. Going from "long and creepy" to "slicker than snot". I have a S/42 1938 Nazi Military re-blue I use as a shooter and the trigger pull is excellent. It breaks a split second before you expect it to break. I took that pistol and another luger to a gunsmith to see if they could duplicate the trigger pull. He said something along the lines of "These are military pistols, not target pistols. The trigger pull is what it is and that is that". I am sure there are others out there skilled enough to modify the luger trigger mechanism if deemed necessary by the owner of the pistol.
Have you field stripped it and given it a good cleaning ? This may help the pull. Especially if the mechanism is "gummed-up".
Sorry I can't comment with any authority on the effect of changing springs other than to say I don't "Think" it would hurt the value. There are others on this forum with the knowledge to speak to that question.
Enjoy your pistols !!
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