Run the needle under some threads on the back to fasten the end of the thread and cut it close. Threading a Tape Through a Casing Thread your tape through a bodkin and run it through the casing. If you don't have a bodkin, use a thick needle with an enormous eye, or use a small safety pin. If you can't get this, improvise with heavy string or lucet cord, or as a last resort, narrow double-fold bias tape, stitched shut along the fold. It can be hard to find cloth tape in your local sewing store.
Several sutlers carry cloth tape.
Wooded Hamlet stocks the most extensive selection, but some other sutlers have excellent tapes as well.