I have this experience with most paper towel dispensers when I follow the directions. Oddly… just grabbing the middle (where there are no vertical edges and less opportunities to rip) works everytime.
I’ve been messing around with an old projector lens from a Kodak slide projector. I printed a barrel that slips over the lens that has m42 threading on the end and attached an m42 to E-mount helicoid to make focusing easier. I can get a pretty clean focus at infinity and the field of focus is surprisingly wide
I printed a barrel to go over this one as well so it would fit in a m42 helicoid so I could focus, unfortunately though infinity on this lens is at 16mm and the only way I can currently get that is literally holding the lens in the open mount hole.
files.catbox.moe
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