Clarinet Tenon

Hole on clarinet tenon?
I recently saw a clarinet that on the tenon to put together the upper and lower had a big hole drill from one side on the tenon to the other side. I have never seen that before. Does anybody know why would a hole need to be drill on the tenon?
Thanks.
I got nothin’
… Is it a name brand? New/used … did it used to have a screw in it to hang it on a wall at a music themed restaurant?
Clarinet Maintenance : Replacing a Clarinet Tenon Cork