I don't know if this is right place or time to provide addition information, but if I sound like self-promotion, please let me know i will get off from this topic.
I have direct connection with DNP. I met with top level manger in 2010 in Toronto, Canada. I have address some of common problem with DNP products. One of them there wasn't enough grease injected into freewheel, which they have corrected since 2009.
Here are some background information, that I hope some of you may find it interesting:
My understanding to produce 11 tooth freewheel is very difficult, especially in 7 speed. I can't remember why. DNP had almost abandoned 7 speeds 11 tooth completely, which I have convinced them no to do so. Now, they are in middle re-design 7, 8, 9 11-tooth freewheel. And I am involved in beta testing with their new freehweel. This is a lot of works, this involve installing 7, 8, 9 speed freewheel on each brand of motor (crystalyte, bafang, mac, bmc, bionx, etc...). We are looking for spacing problem, which motor will not fit for the new freehwheel and what other problem we can find. Then we road test the bike to see if it had any skipping problem. So far, the 7 speed had passed our test, but 8 speed had failed. The first batch of prototype actually stuck on 7 gear, the 2nd batch will skip between 7 and 8, you can see the result in this video here:http://www.youtube.com/watch?v=cmT9h9HYFOo
and the prototype of 9 speed is on its way.
Coming back to original topic, if you know there is problem with the current DNP 11 tooth freewheel, I can help to address the problem, and ask the manufacturer to improve and produce a better quality products, so we can all get a better products. If there is enough communication in this topic, I can ask DNP to join in for the conversation.
Here is what I like to suggest:
1.) please list out 3 thing that bug you with the current DNP freewheel that you have, but please make suggestion instead complain only
2.) You can join me for beta test for new production 11tooth freewheel. I will pay for the shipping cost, freewheel, etc.. If you have more then one type rear motor would be better, and I would need feedback from you.
And if we have enough feedback to manufacturer, we could have excellent products in 2011.