Dave,
Have a look at metal fishing rod ferrules. These were used on old bamboo=20
and fiberglass rods.  Lots of places still sell them for fixing older=20
rods or for people building new rods.  The downside to these would be=20
the diameter -- most would be smaller.  The upside is that you get two=20
pieces -- the closed end for the smaller diameter piece and the larger=20
open end it inserts into.  And, if you are blowing your own glass you=20
might be able to custom size it to fit the available ferrules.  Just=20
verify that the smaller end is closed off.  Good luck.
Bill

David VanHorn wrote:

>I need some help sourcing the metal fitting in the picture:
>http://ecx.images-amazon.com/images/I/310e-2lm8RL._SY355_.jpg
>
>It's 7/16 OD, thin wall brass.  It matches K+S stock tubing except that th=
e
>end is rounded off and closed.
>http://www.hobbylinc.com/htm/k+s/k+s8137.htm
>
>The diameter is critical, the fitting it goes in doesn't flex much.
>
>I am not too picky on length, more than half is good, more than an inch is
>a problem.
>
>A hole in the closed end is actually good, but not critical.
>
>Someone somewhere makes these things, it's probably some common thingus
>used on something I've never heard of.   Can anyone here match it up with
>something?
>
>Jewlery fittings are close, but all I've seen are too small in diameter an=
d
>only about 1/4" long.
>
>
>
>Why:
>
>I have an antique "Violet Ray" device that I would like to make some ends
>for.  It's a rare one, which runs from 32V "farm current".  Such devices
>were made by the truckload around the turn of the century, to cure whateve=
r
>ailed you, but the vast majority are 110 or 220V for europe.  The farm
>current device is unique.
>
>I could just go buy something like in the pic, but I want to make somethin=
g
>more like a geissler tube, which is a bit of a project.  To that end, I've
>taken up glassblowing, found a source of uranium glass, built a vacuum
>manifold and "filling station" and learned to seal off these tubes when
>under vacuum of 1-10 torr.
>
>On Ebay, there is a set of Christmas lights that are for 32V farm current,
>starting bid is $750 for eight lamps in a string.
>http://www.ebay.com/itm/Vintage-Christmas-Lights-Delco-Farm-32-Volt-Noma-4=
-Volt-Mazdas-Extremely-Rare-/171975314757?hash=3Ditem280a870d45:g:~rcAAOSw5=
VFWHB7f
>
>Apparently the decision for 32V went along the lines that farmers generall=
y
>suck at being electricians, so 32V isn't too bad on I^2R losses, but low
>enough for few fried farmers.  Standard 110V plugs and switches were used
>though, which could get exciting if you took your farm device and plugged
>it in on a trip to the big city.
> =20
>
--=20
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