I have a William Demuth pipe with a meerschaum bone tenon that is too narrow to get a pipe cleaner through. I already broke the tenon once by unscrewing from the shank and repair was costly. I’ve tried Falcon extra thin cleaners, but they are still too large. The pipe is almost 100 yrs old so I only smoke it a few times a year on special occasions. Any suggestions on how I might be able to clean the tenon and shank? Thank you.