I discovered a crack on the WP-DC28 locking buckle (shown below) after approximately two years of use. I applied some Super Glue to it and time will tell if it works. Others have suggested using a section of thin stainless steel wire, heating it, melting it into the buckle then applying a glue over the wire and sanding it smooth. Hindsight being 20-20 I believe you can significantly reduce the risk, if not prevent cracking the buckle by COMPLETELY closing the housing back door by hand. The most amount of strain is put on the buckle when the O-ring seats in its groove.