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@whatfriends
Nah. I don't mean go wild. Just easier to mark with a rotary tool than trying to scratch a line with something sharp. Though a few strokes with hacksaw blade should do it easier. It's just about marking the surface, not trying to cut it open. Bare metal frames don't snap when you accidentally scratch them. Go take your alloy seat post out of pretty much any old bike, and see how it's scratched and marked and yet not snapped.
Clearly I take no responsibility for what people do, but it works fine on mine and mines an extended post, almost at full extension.