What happens when you hybridize a bookbinder’s folding rib and a case folder? You get the Casing Rib.

Christine Cox made a teflon version of a wooden potters rib, and discovered it was useful for bookbinding tasks, such as  for covering, folding, creasing, etc. The Bakelite case folder is a traditional tool for similar tasks.

The case folder is first recorded being used by the Harcourt Bindery in 1972 according to Sam Ellenport; likely earlier. A curiously worn version is pictured in Kim Jinsub’s 2016 Book Tools, alongside an actual Bakelite one from Harcourt.

Not to Goldilocks it too much, but for me, the teflon rib is too small, and the case folder is too large. And teflon wears quite rapidly, while Bakelite case folder  has a high coefficient of friction Daniel Mellis made an experimental stainless steel rib, which I enjoyed using, and it prompted my investigators into shape and materials.

So the casing rib was born.

Made from black Delrin, its large size is easy to grasp and apply pressure directly downwards. I use it for turning-in, general smoothing, box making, and more. As its name indicates, it is great for covering case bindings and boxes. Delrin is non-marking like Teflon, and more than twice as abrasion resistant.

“Jeff, this tool is the best. It feels so nice to work with. I'm doing a big edition and using it repetively has been nothing but joy. Doesn't hurt the wrist. My old case folder would sometimes snap my fingers down if I wasn't careful. 10/10.” Gabby Cooksey.

The Casing Rib. Black Delrin, textured sides, rounded top edge, and sharp edges on the bevels. Handmade, sizes vary slightly, ~ 2.25 x 6 x .25 inches.