First a great thanks to Burt for his work and help; seeing what he's done encouraged me to try why not to make something by myself too. I'm not much of a handyman and really don't usually do stuff like this.

So there is my own-made paddle strop and I humbly don't even try to compare it with the job Burt has done, we're clearly not competing in the same category

I couldn't find magnetic sheet nor balsa wood in my neighbourhood, so I had to settle for something else.
Luckily I found these very cheap and already paddle-shapped 'gratters' - or what I think are gratters though I wouldn't use them as such - on the local market.
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I removed the metal part and glued them together. There was still a big hole, so I had to cover the one side I wanted to put the leather on with a piece of wood I sawed.
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I finished it with spreading chromium oxide pasteon the leather.
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It does a great job. I tried honing a gold dollar on a chinese 12k for a couple of hours, stropping on my custom made paddle, canvas and then stropping on leather and I got it passed the HHT!