Only my credit card is blaming you - I'm grateful to you and also to Old Ted for mentioning Mr Gezer. Seems like you're the only one of us three who needs to have a Sevket Gezer. SO JUST DOOOOOOOOO EEEEEEEEEEEEEEEEEEEET!
I've had this one about two years. It has the same connector as yours, and I found it a bit tight for my liking. I have a set of drill bits in 1/64" increments, so I found the one that fit snug, then moved up in stages, opening the draft until it was more to my liking. A bit of clean up on the end with a sharp knife and I now have a great smoking pipe. I just go slow and easy....twist the bits by hand...NO power tools.
Not suggesting that you try this unless you too find the draw a bit restricted.