So now I have a conundrum. I received the Neerup pipe, which is absolutely gorgeous. I tried putting a pipe cleaner through, and it easily passed the mortise and tenon. Then, the cleaner got hung up in the shank. I took a closer look, and to my surprise, the drill hole is perfect in the bowl. Because of the slight bend in the shank, the drill hole and channel through the mortise do not align very well, and this was considered acceptable.
I have some time to think on this (one month return window). I believe I can fix this issue with a fine file, and some caution. This would allow me to smooth out the channel so there isn't a "shelf" for the cleaner to ram into. I have two other options. I could return the pipe, informing the seller or the problem, and the other would be to let the pipe cool after smoking, and remove the stem after each smoke for a cleaning. Not ideal, however based on the purchase price (relatively low), keeping the pipe may be in my best interest.
This situation is way better than another one I am in with a beautiful meerschaum I own. It is nearly impossible to pass a cleaner through the stem, which is unfortunate, and frankly, extremely annoying.