So I got 1 doppler clutch pully and 2 Doppler fixed sprocket pulleys. They all came in different packaging and I think some of them are knock offs. I put on the clutch pulley with my bidolot and shreaded the posts that hold the clutch to the belt pulley within 30 miles. I dont have a back up so I pulled the bidolot installed an er3 and a Doppler fixed sprocket pulley and it started to shread. I was like wtf am I a retard? this is not that hard so i took a look at my 2nd Doppler fixed sprocket pulley and the quality is TOTALY better, the packaging on this pulley had a part number from doppler and has nice stainless steel bearing walls. I really think that someone is selling FAKE DOPPLER PARTS. I will post pics soon. I paid for doppler, the differences are subtle but serious. I am going to give my vendor a chance to remedy this prob before I drop any names.