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+ 1 to what Stu said. Get them honed by a pro. OTOH, If they're shaving well a barber hone, such as a Swaty, would be all you need for the time being.

IME a series of waterstones in appropriate grits, such as 1k, 4k, and 8k or thereabouts, will give best results honing straight razors to a comfortable and close shaving edge. Never tried an India on...