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I just went straight to the recommended stuff. And someone kindly shared a sheet with me when I couldn't find it. But others said it can be found easily.
I reckon you could try electrical tape. Better might be a tough cloth tape. You want something that doesn't stretch and shrink. And you need to experiment to get exactly the right width to fill the "safety undercut". correctly. A bit too wide or a bit too narrow and it isn't as effective, I found.
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