runners?
Alan,
If you mean the wooden "shark fins" that separate the vinyl tray into sections, they have a tenon machined on the underside, that fit in, and are glued to the pine/spruce plywood panel...(The "fins" are apprx 4" x 11/32" overall...the tenon is apprx 2 13/16" x 3/16")..so if your glue isn't loose (you may be able to left and right tap to loosen..), then the only alternative may be to carefully measure and router out the bottom of the plywood panel to release the "fins", tapping up from below...Or maybe you could slide a thin metal putty knife under the shoulder and pry them up, but I would worry about breaking
the "fins"...Hope this is clear.
Dave V. in NC