> Rex
>
> What parts, and where can I get them?
>
> How do I get the seat out?
Each seat has a little flat rectangular piece that fits between rail and
seat base, and apparently is the actually sliding surface for the seat
adjustment. It is steel with a plastic insert. That plastic deteriorates
and becomes loose in the steel part.
Follow the link someone else posted for the www.waycool etc site.
It has detailed instructions with pictures.