HB Windows, a company owned by SMP Inc., who do all kinds of maintenance, not just windows, repaired my sliding glass doors at a very reasonable cost. I called several companies, two of which wanted to charge me the equivalent of airfare to Europe, one insisted on calling the doors "patients" and their company "the doctor", and one that would only accept cash or check at time of service. I was happily surprised when at last I called HB Windows and spoke with Shad Thien, who treated me with kindness, courtesy, and respect, and found they accept credit card payment. The rollers on my doors were replaced in short order at a very fair price. Very pleasant experience!