Thats too bad, a great blast for sure. It didn't look too bad here, but you can't unring that bell. Do those Vernon fitment stems stay tight over time? I've never seen one in person.
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I had to clean out the end of the “mortise” on the stem. There was some leftover goo in there. Once it was clean, the stem snapped smartly into place. No leaks as far as I could tell.
Cutting back the face of the stem shoulder would clean it up. However in this case you’d be ruining the alignment of the mechanism. A cutter with a pilot (like how a rifle barrel is counterbored) would work, and then material could be glued to the new face to make up for what was lost. A disc could be cut and aligned using pilot. Or, a threaded metal insert could be inserted into the stem. Such an arrangement could be adjusted so the prongs of the tenon mate up just right.
I don’t have full machine shop, nor the time and patience to accomplish such a feat…
As for the bowl/chamber, cementing and reshaping the inside of the chamber so that it would smoke well would be an option. I’ve done that to number pipes. But your fine work to make the thing useable devalues the piece significantly.
Now if you could get something on the cheap, it’s not really an issue. The Comoy’s 430 I recently did is a good example. A $40 pipe made into a very good smoker. But it’s not original, and drives the retail price way down.
I think I’ll smoke the Comoy’s today… I’ve given it a break for a week or so to dry out. Waterglass is pretty durable, but exposure to heat, moisture and smoking in a short period of time will cause it to degrade.