for the longest time I have held off buying a polisher or a grinder but broke down today and got a grinder/polisher from harbor freight. It has the buffing wheel on one side and the grinding stone on the other. When I have the buffing wheel in it the whole thing vibrates so bad that the bench its mounted too nearly moves. With the wheel off its smooth as silk, is this something that I just need break in and use a little to balance it out? There isn't any way to adjust it that can see just on/off so is it a bad wheel or just needs to be used? With the way its vibrating it can't be good on it. Also I am curious if the polishing wheels/supplies at harbor freight are worth it or if a kit like eastwood sells is better? Looking to polish aluminum for now.