I purchased a new gmc 10 x 54 and between 2759-3000 rpm I am getting a small vibration in the spindle head. The model is a varible speed unit. Any other rpm range the vibration seems to disapate. I do not have the draw bar installed yet because it is bent and the machine supplier is sendind a new one. Could running the machine without a drawbar cause this? When it vibrates you can feel it in the movements in the table's y axis. Should I check the varible speed drive belt for debre stuck on a pully or any other visual inspections. Thanks for any replies