I only have three pipes with metal screw in tenons (two with built in stingers), and they're antique meerschaum pipes. I'm not a fan of the system. They create condensation, and you can't run a pipe cleaner down the pipes. Thankfully I'm able to unscrew the pipe stem and use a pipe cleaner that way. It's an inconvenience but I really enjoy all three pipes, so I put up with it.