I bought an estate lot of pipes a week or two ago, and yesterday I took one of them apart. It’s a mid 60’s Fisher, leather wrapped bulldog, that has seen better days, and I am restoring it.
When I turned the stem out, it came out pretty easily, and it appeared to have a 1/8” copper ‘tenon’…. “Weird; says I. A quick look at the shank under a bright light, it was obvious that the tenon had twisted off at base of the stem, and it’d been repaired with a piece of copper tube inserted into the stem, and was pushed into the broken tenon in the shank that was left in place.
First I gave the pipe a drink of Everclear through the shank to make the oils and nicotine a bit more soluble. I have a homemade slide hammer with a drill chuck 'rigged up' to it, so after I screwed the tap in, I attached the tap to the drill chuck on the slide hammer, and after about a minute I gave the slide hammer a little whack, and out came the broken tenon. I don't use screws because I learned the hard way. Screws are tapered and push out against the wall of the shank, and it will crack if screwed in to far.
Just for an extra twist, after the tenon came out, I found a stinger embeded into the draught hole with all the tar and nicotine holding it in, and getting that out was a whole other adventure... but it's out. I was the one that needed a shot of Everclear after that.