It's furn to see all these names I recognize.
If I recall correctly the file cards were on short legs that allowed the file cards to pivot back and up when the carrier was moved forward. They were beautifully constructed.
They were having issues with being turned around at West Michigan. It was a purpose built machine, it could only move forward and couldn't really turn, so if you could turn them around they couldn't move the goals into their home zone. They had added file card material to the rear wheels to prevent this at the championship.