The Clockie - why a rear chain tensioner? - because commuting in London on the bike the transmission was quite harsh, low revs, slipping the clutch, filtering etc
It could have been a decidedly worn clutch basket or a poorly lubricated chain /worn sprockets etc. that was one of the abiding memories of the bike before I parked it against the garage wall for 10 years.
Anything that would smooth the transmission and was a challenge to make /design was, therefore, something I should at least try, no stronger rationale than that
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