Hey guys I have just picked up an arrow 750 with a 2100 control. I am having serious finish trouble. I did test cuts before buying this machine and never saw anything like this. The spindle sounds great at all RPM's I have done several tests and believe the cartridge is sound. The belts are nearly new and properly adjusted. Things sound fine until the tool engages the work piece. At this point it vibrates and shows right up in the finishes. While plunging with an end mill, drill or spot drill it chatters. At this point I am thinking my draw bar is not holding tight enough. Any thoughts on this would be appreciated. I know this draw bar uses spring washers. I do not have any assembly drawings. Has anyone replaced these before? How tough is it to do? Were can I get part numbers and replacement washers? Any help would be great. I need to be making chips with this machine now !