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Iakov, I purchased the untreated leather/cowhide at a retail store. Just regular 2 1/2 inch strips they have hanging there. You should be okay gluing on the other side if it is not stained or...

I used 800 grit sand wet or dry paper. I sanded until the strips were flat. My leather was very dry.

Are you using crox with neatsfoot oil or similar? If the leather is treated or is Latigo it...

Here are some pics of a 4 sided paddle strop I made. The wooden blank was purchased via our own Doc. The pre-cut leather was purchased at Tandy leather. I glued two strips at a time on opposite sides...