What turned up from Kernow?

J'know - I have never stuck the drill in reverse in order the reduce miles - not sure if the miles can be wound back on these speedos. Maybe someone will know? I've only ever wound them 'on' before - the first one being that from a CBR600 Jelly Mould. I bought a speedo for it was showing 12k and I wanted a spare for my 17k mile bike. To be honest, by drill, that was a bit of a journey - took at least a month near enough every night back in 2011. The wife heard the drill and wondered what I was up to for so long.