We contracted with Allen to install a glass shower door in our master bathroom in our condo. We purchased the door at Home Depot as a special order and made arrangements with Allen for him to pick it up at the store and perform the installation. We provided Allen with a description of the door that we had purchased so that he would make sure that it was the correct one when he went to get it. Allen picked up the door as planned and showed up on schedule to perform the installation. The door was quite heavy because it was a 3/8 in glass one, so I helped Allen transport it into the condo. I showed Allen the room and he promptly went to work. He explained that the shower area had some irregularities and he would have to make some careful measurements so that it would fit correctly. He seemed to have everything under control so I stayed out of his way. Part way through the installation, I heard Allen yell an explicative. When I went to find out what happened, he explained that he had made a serious mistake with regard to one of the measurements and had cut the top rail too short to be used. He was quite distraught about the mistake he had made. I asked him what he could do about it. He said that the only solution was to order a replacement top rail, which would take a few days to get. He immediately contacted that manufacturer and ordered a replacement part to be express shipped to him. The part showed up several days later and, as soon as it did, Allen dropped his other work and came over in the middle of the day to finish the installation. As he made his measurements and cuts he asked that I double-check them. I did, of course. As it turned out, the installation was still quite difficult as the instructions were not particularly clear (even with both of us looking at them). An additional problem is that the instructions called for the installation to be done by a team of two. Since Allen came alone, not realizing the magnitude of the job, I served as his assistant and we finally got the door installed. There were some issues regarding alignment of the doors within the frame, but Allen figured out how to correct it and working as a team, we made the correction. After several hours, Allen was finished and he cleaned up after the work very well. The doors looked great! I think Allen bit off more than he was prepared for with the extra-heavy 3/8 in doors, but he came through at the end to complete the job satisfactorily.