Here is what the IL consists of, besides the hammer features that interact.

I was not able to remove the spring from the flag itself, without a microscopic tool to unsnap one of its legs from a detent, but to show it better, I slipped a small scrap of paper between its free end and the flag. You can see the coiled part around the tiny post. This spring is not much thicker than the hair line on the rule.
That is the inch scale, showing 1/16 ths of an inch, on the ruler under the parts. The other all-coil spring is itself pretty small, but looks huge in the photo compared to the flag spring.
These hard and brittle little bits are easily able to chew up an alloy frame they inhabit, screw up the action and jam the hammer when they break, get out of place, or worn.

Once they are all removed, you have a tiny pivot hole in the frame near the cyl. release, and a small hole left by the lock tumbler, marked "L" on the frame. "L" for Lubricate. If these little holes worry you, pocket lint or whatever, you also need to plug up the rest of the gun's holes and cracks.
There are 5 or 6 charge holes in the cylinder front face, a relatively huge gap above and below the cylinder, and behind it, a holes and slots in front and behind the trigger, and a large hole in the muzzle, where your pocket junk would cause you more trouble than the two little IL holes in the side of the frame. Do you really let your carry gun get that messy ?