My Makita 9227c just arrived...I'm waiting for my backing plates to arrive in another order...I noticed with the stock 7" wool bonnet when i fire the machine up on lower speeds (say speeds 1-4), there is quite a wobble...? The bonnet appears to be centered...I'm not holding it against a surface when i am doing this...Is this wobble normal for this machine with the 7" wool bonnet? It is my first rotary, so i am not sure if this is normal...thanks in advance...