I have a number of B+H filters and all have retaining rings. Something doesn't sound right, they are a division of Schneider Optics and are known for quality products. I would first try to get a resolution to the problem through the vendor and if not contact Schneider directly. Through the many years I have accumulated a number of filters from other mfg's and all had retaining rings. I settled on using the B+W's because the mounts are brass. The last ones I bought were from Calumet and B&H about 5 or 6 years ago and all have been problem-free.