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Well from my engineering training and my technical experience, I would say they did it for noise suppression and smoothness of operation. It is also likely that by using a 10 times larger gear in plastic than a three times tougher gear in metal they designed a gear that last three times as long.
Even with my background I try not to "Monday Morning" engineer.
Obviously, the material used is a critical design component.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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