ORIGINAL: RCIGN1
Before someone gets on here and complains about the cantilever crank, the problem with the DA 50 crank was not the design, it was a crankpin hardness problem...There were about 1000 softer pins mixed in with the good ones..Short of doing a Rockwell hardness test on all the pins there is no way to identify the bad ones, the manufacturer has to trust the supplier....The bad ones were replaced...The last 5000 or so DA 50s had ZERO crankpin failures...
The way it should have been done is for DA to randomly test parts for quality, let's say they test one out of every hundred, or have the manufacturer provide certification tests for each batch produced to verify quality. That's the way it's done in my business. New suppliers aren't trusted based on nothing, they have to earn the trust through a quality program.