We let this go for a shameful amount of time before I decided I could probably fix it. The roller broke so you could only pull it out about halfway or it would come off the track. I looked up the part, and bought it. Actually bought two in case it happened again. When I arrived I looked at how it was put together on the other side and then just basically pushed it onto the rod and it was fixed. I am ashamed it took so long to do it. Never be afraid to try it yourself. It was a total of $10 shipped to fix it.
Went to on line video and followed it. The old gasket came right out and the new one fit right in. Started at the top middle and worked the gasket in on both sides to make sure it was evenly spaced.
The part was perfect. The repair video was very helpful, except it did not include the disassembly of the old part. I figured that out, and all went smoothly until the final step. The screw included required not a slot-head screwdriver which everyone has, not a Phillips head screwdriver which everyone has, but a screw requiring a specialized driver that no one has. WHY? I substituted a normal screw and hope that does not mean the terrorists have won.