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It's certainly been done - look on eBay for paddle strops and you'll see 4-sided ones fairly often. Those were used with a series of pastes, which were and still are favored in Europe over stones. I...

That's a good thing about the Shapton Glass HR, they're so fast you don't need coarse stones that much. I just set a bevel and removed a small chip and some edge wonkiness with a 4k. It took a little...