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Cheeky, what's wrong with my faces :) roo strops work, I have one, but nothing else leatherwise to compare it to.
The naniwa 12k is a popular stone, I have that and a 10k (dont ask), along with...

Yeah it did sound a bit confusing in hindsight :)

2 things come to mind, first is the stretching I push my teeth out and pull my cheeks back sometimes. This is done with my jaw muscles. Sometimes i will sort of do a bit of that and pull my cheek...