The curse of the frozen Kaywoodie stingers

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Is it this one? Does look like the stinger tip was sawn off before it locked. Probably corrosion. Try a penetrating oil that isn't deadly, keeping it away from the wood. If that doesn't work, put it in the freezer. There are 50 ways to deal with these. Those are the two I know. And cover your pliers with leather or something so you don't scratch the mortise piece or stem, looks like you already know that.

Tom FTW, 45 seconds faster. :clap:

Just patiently use a little alcohol. Patiently. It'll unfreeze, because it's probably just the tar residue that the human before you neglected to clean out.
Folks need to understand that older estate pipes were "disposable", so after the "last smoke" it was tossed in a drawer and forgotten about.

Tom FTW, 45 seconds faster

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Yes, but yours came with advice! :clap:

Only alcohol will work. I've done many of these. Patience is key.

Did you get the 600 apart? I have come across several pipes with aluminum threaded connectors that have more or less welded the two parts together,not from tar build but from oxidation of the aluminum parts. Soaking with alcohol or some type of oil generally will not work. The easiest way I've found to get them apart is to heat the stem in the area of the stem face--gotta get it pretty warm--heat gun is best if you have one-- and remove the stem from the tenon by unscrewing it or pulling it off depending on how it's made. Grabow Ajustomatics you pull off since it is a friction fit. With others the part of the tenon in the stem is threaded but generally require heating before they will screw off.
Once you have the stem removed you can get at the aluminum parts. I have found that repeated heating ( I use a Bic lighter) and cooling-dip it in water-- along with a bit of penetrating oil will break it loose although it will not always come out easily once broken loose . If you can turn it slightly with padded pliers it will come out with patience. Rock it back and forth--tighten-then loosen-back and forth trying to move it farther each time you turn it counterclockwise. Don't force it. Once you get the tenon out of the mortise you can clean both pieces. You may find that the oxidation has severely damaged the threads, maybe requiring a new tenon.

Once aluminum is corroded to that point, there is nothing but corrosion and force of habit holding it together. When it separates, it disintegrates. Some of my Grabow push tenons have some pitting from corrosion caused by moisture, and it scares me for the long-term outlook. Sorry about the loss.

I'm probably out in left field, but if this is a Drinkless, with the stinger that also has the threads that hold the stem in the shank, it appears it was sawed off and then (maybe) glued or otherwise stuck in place, not by oxidation, but intentionally to hold the pipe together. Maybe there's much I'm missing, but it looks like an odd patch job to get rid of the stinger. With Drinkless pipes, the threaded stinger is fundamental to the integrity of the pipe, not like regular stingers where you pull them out and go on smoking. I have one Drinkless, and the stinger doesn't mute the flavor nor present much of a problem, except to need cleaning after each smoke. It's a good little pipe, an old American factory gem.