The easiest fix may be to gently flex the leather opposite the cup. I usually place a few fingers on each side and squeeze, causing the center to bow upwards, the edges to curl down then slowly run y hand down the length of the strop a few times. One can also lay it longways along the edge of a table and sort of gently fold it along the edge causing a bow instead of a cup shape. Then go shoeshine fasion over a tables edge a bit to even it out.

Once "corrected" they tend to stay flat.....if not send me a PM or e-mail and I'll fix you up. (and no, you won't hear Dovo or Jemico making that offer <g>).

Tony