Nord Lock washers - has anyone used them?

The Workshop
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Has anybody used these?

It says not to use against a Hard surface like ceramics as they need to impress into the surface - really? And I hear that the torque needs to be increased by up to 20% to ensure they work.
Increasing torque on bolts would elongate out of spec but I don’t think I’d want to use on those applications

There are places on bikes that may warrant these but they are pretty expensive for a washer - normal use sizes are around 60 to 70 pence each!

Looks like I’ve talked myself out of using them…but they may be of use to others

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These crop up now and then at work when there’s an issue with things coming loose.
About two years ago there was a large investigation to see if we should change to Nord Lock for a particular area. The findings were, vague and due to the increase in parts, too complex for some of the maintainers, the idea was thrown out

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That would definitely depend on the type of ceramic.