sirimiri
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The 35-70 f/4 ROM Leica's inner ring/diameter which contains the lens elements does indeed move both beyond and behind the outer focussing ring.
If you use a stepping ring it will restrict the movement significantly. You can get infinity focus from 35mm to about 43mm, after that the inner ring "goes turtle" and slides inside the barrel, never to re-emerge while set to infinity.
For reference, at about 50mm with the focus set to 3.6' or so, a stepping ring will work - barely.
However, at minimum focus distances, the inner element barrel will always stand proud of the outside barrel focus ring...but that's of little use for what I assume you're doing: shooting landscapes with a filter system of greater diameter than E60.
Frankly, the use of the E60 diameter and this hide-and-seek barrel/cam movement really limits the use of anything except an E60 diameter. The inner barrel rotates about a quarter-turn when you rack from near to far. I guess you could go the Rube Goldberg route, and stack a bunch of E60 rings to make a "tube" that protrudes just far enough past the outer barrel at your chosen maximum focal length, so that you can then add a stepping ring, but...why?
Taken as a simple R-mount lens, though, it's pretty good performer. It has good color and sharp rendering without too much color fringing either axially or laterally when shot wide open. The macro function adds a lot of versatility as well. It's a great all-purpose lens in most any respect, but of course is engineered to certain spec which means you get all the wonky external movements, with barrels sliding and rotating like any Canon kit zoom.
And I agree with Steve's assessment of the cap - it's a slip-on type that is ludicrously bad, plus it has a convex front so you can't really place a lens/body combo face down with it on, lest it topple.
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