Are Some Tenons Made of Different Material Than the Stem?

[Sloopjohnbee]

Title edited: Capitalize important words. (Rule 9)

I noticed that there was some flakey peeling/shredding/unfinished edges of rubber/plastic on the tenon end of a Savinelli 6mm vulcanite filter stem
Following a smoke I just ripped the peeling edge off the tenon and came right off - but when you look at it is seems more like shredded plastic, rather than actual vulcanite - and the tenon sitting within the stem itself looks to be a different patina of black
are the tenons inserted afterwards - is this for durability and replace-ability? is making the entire unit from vulcanite/ebonite not a possibility? expensive?
Educate me

 

[sablebrush52]

The short answer is sometimes yes and sometimes no. Post some photos of the tenon, detailed, clear, lit, macro, including the area around where the tenon joins to the rest of the stem and someone here may be able to tell you if the tenon has been glued into the stem.

 

[Sloopjohnbee]

The short answer is sometimes yes and sometimes no. Post some photos of the tenon, detailed, clear, lit, macro, including the area around where the tenon joins to the rest of the stem and someone here may be able to tell you if the tenon has been glued into the stem.

It reads savinelli in circular print on tenon border

 

[fireground_piper]

Man, that's a real thin walled tenon. Crazy.

There's a few tenon options that are popular that I see a lot. Integrated tenon where it's shaped from the rod stock so whatever the mouth piece is, so is the tenon as it's all 1 piece.

Delrin tenon where a hole is drilled out from the mouth piece rod and glued in. It offers a very slick finish and less prone to seizing in the pipe shank over time but with the added potential failure that the glue could fail one day.

Metal tubing or fiber composite. Usually seen in bamboo shanks, eltang basics, etc.

 

[Chasing Embers]

That looks like a replacement tenon. Was that an estate purchase?

 

[Sloopjohnbee]

Man, that's a real thin walled tenon. Crazy.

There's a few tenon options that are popular that I see a lot. Integrated tenon where it's shaped from the rod stock so whatever the mouth piece is, so is the tenon as it's all 1 piece.

Delrin tenon where a hole is drilled out from the mouth piece rod and glued in. It offers a very slick finish and less prone to seizing in the pipe shank over time but with the added potential failure that the glue could fail one day.

Metal tubing or fiber composite. Usually seen in bamboo shanks, eltang basics, etc.

It's so thin it started peeling and flaking, Some chips may have ended up in my throat

 

[Sloopjohnbee]

That looks like a replacement tenon. Was that an estate purchase?

it was indeed, but it reads savinelli

 

[sablebrush52]

I can't say for sure whether or not that an integral tenon. I was hoping to see a trace of a film left by wiped away cement around the base where the tenon fits into the stem, but I can't see any. For some reason this reminds me of Delrin but I'm not sure of that either. This is a question best given to a pipe restorer like George Dibos, whose moniker here is georged.

 

[Chasing Embers]

it was indeed, but it reads savinelli

Possibly replaced by Savinelli. They and Peterson do factory stem repairs and replacements.

 

[ofafeather]

Also Savinelli’s approach recently seems to be to make most tenons for 9mm filters then glue in step down adapters. There’s a thread from not long ago showing a 6mm step down that had come loose. It was clearly glued in originally. I don’t know if that is the case here. Maybe dried glue.

 

[jpmcwjr]

Photos: a bit more light, but darker background, unless you can spot the exposure on the pipe.

 

[Chasing Embers]

Photos: a bit more light, but darker background, unless you can spot the exposure on the pipe.

Looks fine here. Click on the image.

 

[jeepnewbie]

Looking at the image it looks like a two piece. If it was an estate purchase it could have been repaired using a hard plastic. Looks like a seam around the filter to the rest of the stem. Hard to say without seeing it in person. From the images looks like two shades of black also. I can’t recall on my Sav’s as I don’t have one with me. I don’t remember them making two piece stems. That filter part looks like it was an injection mold piece though.

 

[sasquatch]

Savinelli has used a glue-in teflon tenon for years, they are generally super reliable. Easy enough to change out too if you do have a bad one.

 

[odobenus]

I recently started to feel freaky about delrin but more particularly teflon tenons. You don't want that stuff degrading and entering your body (though it's claimed that new teflon is PFOA-free, for whatever that's worth -- I still don't use non-stick pans).
Noticed that Moretti uses teflon, for example, and that will make me avoid those pipes, which is unfortunate, as he does great things with bog oak.
Recently commissioned a pipe for the first time ever and I double-checked that the tenon would be hand-cut from ebonite.
Oh well, the world is full of risks.

 

[Sloopjohnbee]

I recently started to feel freaky about delrin but more particularly teflon tenons. You don't want that stuff degrading and entering your body (though it's claimed that new teflon is PFOA-free, for whatever that's worth -- I still don't use non-stick pans).
Noticed that Moretti uses teflon, for example, and that will make me avoid those pipes, which is unfortunate, as he does great things with bog oak.
Recently commissioned a pipe for the first time ever and I double-checked that the tenon would be hand-cut from ebonite.
Oh well, the world is full of risks.

You know, I had a thread a few years ago - I had one of those newer turkish meers with the push pull delrins
and the chamber to shank/mortise ratio is very short - the plastic began to melt - and it's supposed to be heat resistant - long story short - I had it modified to a bone screw by Mike Myers
as long as the plastic doesn't melt you are fine - but in shorter pipes it could become an issue - especially if you smoke hot like I sometimes do
All of it is toxic - even vulcanite/ebonite - heck tobacco is toxic - you don't want the tar in your system lol

 

[sasquatch]

Worrying about the Delrin in your tenon as a health risk associated with pipe smoking is like ordering a triple cheeseburger, chilli cheese fries, and a diet coke.

 

[odobenus]

You know, I had a thread a few years ago - I had one of those newer turkish meers with the push pull delrins
and the chamber to shank/mortise ratio is very short - the plastic began to melt - and it's supposed to be heat resistant - long story short - I had it modified to a bone screw by Mike Myers
as long as the plastic doesn't melt you are fine - but in shorter pipes it could become an issue - especially if you smoke hot like I sometimes do
All of it is toxic - even vulcanite/ebonite - heck tobacco is toxic - you don't want the tar in your system lol

Worrying about the Delrin in your tenon as a health risk associated with pipe smoking is like ordering a triple cheeseburger, chilli cheese fries, and a diet coke.

Hah, yeah, I know it ain't rational.

 

[fireground_piper]

Also acrylic has a slightly lower melting point than Delrin so an acrylic stem would melt in your mouth before the delrin tenon. Vulcanized rubber is a bit higher.

If you are hitting any of those melting points, you have a different problem though.