Wonder Zip – Zipper Threading Aid
With the Wonder Zip Zipper threader, threading the slider onto an endless zipper is child’s play!
How it works: Slide the Wonder Zip over the edge of a table top and insert the zipper / slider into the slot on the top. Thread the two halves of the zipper into the zipper at the same time, forming an approximately 90 ° angle. The caterpillar of the zipper points to the table top. Slide the zipper evenly backwards. Finished!
You can find step by step photo and instructions here (in German but open in Chrome to translate page easily)