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I was. I bought a Nexus 7 7C16 a few weeks ago and was not satisfied with the large amount of friction I was experiencing as a result of Dust Cap B making contact with the sprocket on the hub. This resulted in measurable slowdowns of the wheel against the sprocket, especially whilst coasting.
The fix is to buy a new dust cap for the more recent nexus 7 models, and fit it to the older hub. It is still backwards compatible with the older hubs and eliminates the friction.
Dust Cap C remains the same.
Contents:
0:00 - Symptoms
1:20 - Fix