I purchased the drums from Larrys Thunderbird. The guys I dealt with were very professional and kind. They've already contacted their supplier and getting corrections in order. My issue was resolved this morning. I removed the hub from the offending drum and found a burr in one of the lug stud holes. I lightly polished it out, pressed the hub back into the drum, reinstalled and have no issues. Evidently, the burr caused a very small distortion and resultant rub. Going forward, I will check parts over as a first step. My 'Bird stops as best as can be expected with drum brakes. Best of all, it doesn't pull to one side.