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Just use the spare in the jar Mick :roflmao

Yup. It's a tricky timing at first which is why I recommend practice with something dull at first :)

I can't understand how stopping the razor teaches you the "proper stroke" ie rolling the razor on the spine :shrug: or are you referring to something else like proper contact.?

This is worth repeating.

Hesitation cuts come from a stopped blade.

Ideally you should have the skills & muscle memory down pat before putting a sharp blade to a strop. A strip of newspaper...