Hello,
If the received slider is ineffective, it is certainly because the reference chosen to repair your closure is not the right one.
As announced on our website, reference 3B is rare: "Warning: Reference 3B is rare, please check if you need slider 5B instead."
If your slider is not the right size, you can still request an exchange or a refund; here is the procedure to follow:
https://www.boutique-zlideon.fr/content/11-retourner-un-produit
Do not hesitate to contact customer service if you need help finding the necessary slider:
[email protected]
See you soon