Ive had a couple of them, the 1886 is my all time favorite rifle.
There is no extractor spring, the extractor is the spring.
I personally have never felt any desire at all the reduce any springs in mine. They function fine, and will loosen up some with use. One thing right off, oil it. Then sit and cycle the action (not dry firing, just cycling it). It will wear in some, or if you want it smoother right off, after working it a bit, take it apart and carefully stone the parts that the blue has worn some on, on the bolt, tip of the lever, and inside the frame rails.
The first one was a rifle. After shooting some heavy 500 gr loads (1750 fps) I decided enough was enough and had the crescent cut off the stock. Ive never cared for crescents much anyway, and this was a huge improvement in overall handling. They wont explode if you drill holes in them. after the first time I dropped mine in rocks, I drilled it for sling studs, (stock and fore end cap, like the old ones were done) and I didn't hesitate at all to drill it for a receiver sight. Tang sights aren't on my happy list either, they seem to be more irritating than anything, my thumb wants the same real estate. Why stop there,...I also cut the barrel to 22" and its nearly a perfect rifle, adding a true shotgun butt will complete it.
I did mostly the same things to a carbine, except for the butt, I can be happy with a carbine butt. with a 20" barrel they are about perfect as a mountain carry gun in grizzly country, which starts not far from my door.
If you drill the receiver yourself, turn the tap back every quarter to third of a turn, the receivers are quite hard compared to the originals, I broke a tap in one of mine trying to go bit farther than I should have before turning the tap back to break the chip.
The 86s look great with a Lyman 56 receiver sight. Not quite way back period correct (think they came out in the 20s?), but a very good and classy looking sight, much more so than anything I recall seeing made currently other than the Lyman 21 type.