Alas, tis true.
Have you seen this guy on teh 'bay? All his stuff is 9mm tenon - which is 0.354. Should be easy to sand down the 10 grand to fit a 11/32 cob pipe.
I don't like that they all seem to be the 'filter type' but what the heck...
Pipe Smoking Accessories items in stem blank store on eBay!