I had to replace the wheels on the bottom of the screen door
associated with my patio door. But, I can't figure out how to rehang
the screen door. The upper rollers ride in a channel/track the
opening to which is smaller then the rollers.

Here are pictures:

http://img205.imageshack.us/img205/7...1030200re9.jpg
http://img210.imageshack.us/img210/3...1030203bw3.jpg
http://img170.imageshack.us/img170/9...1030197gz6.jpg

This is a sketch of the cross section of the channel/track:
http://img404.imageshack.us/img404/5738/graphic1xh1.gif