[supdaf]

I just had a very similiar problem. I found that the build quailty of the (brass in this case) wheel was very poor. On careful inspection I saw that ther was a larger concentration of "wire" at one point on the wheel. This was also the point where the wheel would come to a stop after switching off. In short this particular wheel was terribly out of balance. I thought about trying to fix it but decided on just buying another. The second one was OK. Now both of these wheels were inexpensive and had I not found joy on the second I would have most likely invested more money in hopefully a better wheel bought somewhere else. These were from Lowes and little selection could be had.