I corresponded with a manufacturer of replacement parts recently over a photograph of this "servo" clutch center and told him what a great improvement it is in operation over the standard clutch center with straight splines. Very light lever pressure, does not slip under load because torque increases it's clamping power, and it releases and slips when a lower gear is engaged abruptly to keep the rear wheel from locking. I am sure this manufacturer is wondering what the market for these would be. A simple bolt-in swap at a fraction of the cost of converting to a Commando-style clutch and belt drive setup. I used one for a dozen years in a 650cc Dominator and don't ever want to use a standard clutch again. Would you buy one for your bike with an AMC gearbox?