After using my 3 Brog pipes for 2 months the stems on two of them just broke last night within minutes. Just called Mr Brog customer service at 212-366-5483 and they told me they will replace the stems since they are less than 6 months old.
Can also reach them at MrBrog@mrbrog.com
One split in the middle while pulling it out from the stummel to clean it. see pic. The other one the tenon broke off while knocking it against my hand.