First, face the FACTS..... it didn't 'come off'.... you WRUNG it off! If you don't word these things properly, you'll make the same mistake in future.... YOU did it, not the kart!
With a bolt, the 'friction' is usually in the contact point between the head and the item: thus, when you wring off the head of a bolt, it'll often be easy to rotate the remaining thread to remove the threaded-portion.
With a bleed nipple, the 'friction' is between the END of the nipple and the item. Thus, wringing the 'head' end off the nipple off has NOT made the remaining nipple easy to remove.
There are some options before drilling and threading.
1) Easy-outs.
http://www.axminster.co.uk/axminster-cobalt-drill-and-easy-out-set-prod462398/?src=froogle
The stange looking tapered drills (backward threaded, you'll note) is the device you need. It's a sort of 'tapered corkscrew' with a left-hand thread. Basially, you 'wind' that into the hole (you can drill that out fractionally first) in the nipple, counterclockwise. Hopefully, it grips and you continue to turn in the same direction. If you are lucky, the Easy-out will stop 'screwing' into the nipple and it will thus UN-do the broken piece and extract it for you.
Do it CAREFULLY..... Easy-outs are hard and thus very brittle! Do NOT put any sideways force on it. If it breaks off IN the nipple..... you are in trouble if you finally need to drill it out!.
2) If there's enough thread showing, a good welder may be able to weld a 'bolt' to that last bit that remains.... enough to let you use the bolt to undo the nipple.
3) Take the whole thing (caliper, master cylinder, whatever) to a good engineering shop. They will (probably) make less of a mess of it than most of us would!
Ian
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My nipple fell off! by 'GR2' (26 Apr 2011 @ 14:19)
