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I have DIYed these in 2 different ways.
Method 1: I took an old mouthpiece and drilled a hole in it just large enough to press fit an 1/8 or 3/16 tubing splice- which ever fits your mag's hose. The mag hose (I use a manometer) slips onto the splice. This particular one is a 1/4 splice because I used 1/4 tubing on my first manometer but I have since built another manometer with 3/16 tubing.
Method 2: I took a 2" piece of 1" plastic tubing and drilled a hole in it, installed a 1/8 (3/16) tubing splice and connected the mag hose. It looks similar to the mouthpiece one except it's a length of clear tubing. I don't have a photo of it handy but I think you get the idea.
To answer your question, yes there is a bored hole and it is rounded off which, represents the end you put into your mouth. Then the rubber band material goes over the housing in place of the mouthpiece.