Where can I get this part?

That's probably a stoker stem for a tandem.

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Stems do not terminate the bar, its just a locking cap that is on top of
the headset. Its not the stem thats has the cap, its the headset. On a
bike, its the bearing thing that lets the fork turn.

'Reallly good stem for $11' (http://tinyurl.com/4da6z)

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That's a standard threadless style bicycle stem. That's the style that
most mountain bikes and road bikes are using now. The stem clamps to
the steer tube (the tube that comes up from the fork). I'll attach a
picture that will make it more clear.

There's more than one size of threadless stem. Some are designed to
clamp to a 1" diameter steer tube. Some are designed to clamp to a
1-1/8" (28.6 mm) diameter steer tube. And there are a couple other
sizes available now too (for tandems and downhill bikes). I used a
1-1/8" stem which is the size most commonly used on mountain bikes. The
boom tube that I used was 28.6 mm (1-1/8"😉 in diameter.

The stem in the attached picture has about a 5 degree rise (the angle it
points upward from the stem). The stem I used on my JC Coker Handle has
about a 25 degree rise. But on the Coker stem the amount of rise is not
important other than aesthetics because you can slide the stem anywhere
you want on the boom to position the handle where you want it.

I've got more details about the JC Coker Handle in my 'Miscellaneous
Stuff gallery' (http://gallery.unicyclist.com/john_childs_misc) along
with links to the threads describing it in more detail.

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one would be enough. just cut it in half and weld another piece of steel
to fill the gap to make it your desired length.

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deadlydes said:

*so you need 2 stems?
one to go on the steer tube which you have cut the end off and
inserted a peice of tubing and one on the end of the new tubing to
attach your 'handlebar'. is that right?

i have been meaning to get a 'handlebar' for ages! *

Yes there are two stems. One adjustable stoker stem and one MTB stem.

I didn't cut anything off of the stoker stem. It's an adjustable stoker
stem and I just took out the bit that holds the handlebars and replaced
it with the long boom.

If you buy everything new at full suggested retail price the cost of
this handle would be quite a lot. I got a lot of the pieces used from a
local bike shop that sells used bike parts. I got the stoker stem from
eBay cause the guy was selling the stems for much less than I could find
them at retail.

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can you get the stocker stem in the UK?if not do you know an
alternative?

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deadlydes said:

*can you get the stocker stem in the UK?if not do you know an
alternative? *

The adjustable stoker stem is a standard bicycle part available in the
bicycle parts catalogs over here. It should certainly be available in
the UK. Here's a link to the stem at an online shop so you can see what
it's like: 'aebike stoker stem'
(http://aebike.com/site/page.cfm?PageID=30&SKU=SM4586).

An alternative would be to weld something together to do the same
function. Or you could possibly chop up an old bike and use the top
tube like you can see in 'Will's gallery'
(http://gallery.unicyclist.com/albun56).

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