Quote:
Originally Posted by Nate Laverdure
Inside a 2" tall x 1/8" wall extrusion, this kind of chain retention only happens when using 17t sprockets. 2363 uses 16t sprockets. There are different reasons why our chains don't come off the sprockets.
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My point was not that all chain-in-tube has close-fit sprockets (the one pictured in OP is not), but that this technique could be exploited with a dead axle to make even "tape measure and drill press" tolerances feasible.