I got a TM starter strop (not sure if it's leather or vegan) used off B&B, and I've been having some trouble getting it flat. I've found that once I get about 7 inches away from the top, the center of the strop dips such that razors only contact on the edges of the strop.

I've tried putting the strop on a flat surface and laying books on top (textbooks, no less), but after a day at most, it reverts back to a bowed shape. I was hoping someone might have another suggestion on how to keep it flat.

Thanks.

EDIT: My bad for not searching. Reading other threads now.