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@TurtleRecall
Bought one of these a while back: http://s.aliexpress.com/Z7raUVJj
Fitted it today after my arse started suffering midway through the Dunwich dynamo. Only tried it on the turbo so far, but once I got it in the right position it actually felt pretty good. Not sure which smp it's a copy of, but I'll keep it on there for now and keep you posted.