[Ron Ramirez]

"Cardboard" was not the correct term, sorry. That's what I get for replying in a hurry.

Heavy brown paper is more correct. There are some wires embedded within the paper which acts as a shield of sorts; the shield is not really necessary and the loop will function quite nicely without it. Trust me, I have seen much worse loops than yours. And as stated before, I have one here with the paper covering completely gone, and it works just fine.

By the looks of yours, it seems to me that some careful application of glue will take care of the ends where the paper is pulling loose from the wooden end pieces. Do that, and resleeve the wires, and your loop should be in good shape.