Jeff arrived on time and had his son with him, teaching his son the business. He wasn't familiar with my Delta shower door. But, following the written instructions that came with the door, things went smoothly. However, Jeff & I both saw that the doors slid to one end, rather than hover in place. Jeff knew the top rail was not level, but left anyway. I called him to return & fix and with some rescheduling, he came back and cut one upright by 1/8". Not quite enough, but it will do.