Broken off bolt

Dammit - was just giving my bike it's monthly check - tighten all loose bits and stuff and I found that some of the bolts holding my rear rack were loose.

Easy job - quick turn........felt quite loose, a quarter further the head sheared off.

Damn, I am pissed off. it is completely flush with the seat stay and now I have no way to get it out. I'm gonna have to tie the rack on somehow until I figure a way to get it out.

I'm stuffed for tools here - What should I do? I guess you need to drill it and put a reverse threaded screw in. I'm fucked if I know I can get one where I am. I don't even know what it is called in Polish.

Piece of shit bike has cost me more in small parts than I origianally paid for it. Serves me right for buying cheap crap I guess.

I guess you need to drill it and put a reverse threaded screw in.

Yep, but this is very tricky on small bolts. Most of the 'easy out' reverse threads are fairly large and finding one small enough is a problem. The smaller sizes tend to snap before they generate the torque required to remove the seized bolt. It may be easier to drill the whole bolt out and re-tap the hole.
A well equiped LBS or maybe even a fabrication/metalwork shop if theres one nearby can help.

where're you in Poland?
there are some ace shops in Warsaw...

Try and somehow grind a slot into the bolt head with a dremel or something so you can get a flathead screwdriver in there.

Failing that, drill out the bolt really small, tap in a smaller screw, then araldite it in there, WD40 the fuck out of it, then unscrew that way...

Might be able to dremel it - I just need to find the right bit. I'm sure I don't have anything small enough but I can check the local DIY shop.
I'm in Wrocław and I'm always at a loss for bike shops - they always seem to screw me over. I'm going to look for a dremel and failing that I'm oging on a bike shoop tour to find a decent place. Warsaw is about 3 times the size of this town and it has the Pruszków velodrome - I dream of living a bit closer!

how big is the screw? I've a left threaded screw that's about 3.5mm i got on ebay, any smaller you'd probably be easier slotting and screwing out wiv a screwdriver.

Is it in the eyelet on the drop out or at the top of the seat stay? IIf it is in the drop out eyelet and you can't create a plain screw head on the remanance of the bolt you may be able to drill a small hole in the back of the screw from inside the dropout, then drive a self tapping screw in and keep on screwing in the hope it will drive the headless bolt out. Spraying the shit out of it with WD40 1st is allways a good idea!

they always seem to screw me over

:D

I got it out!
As usual the guy in the bike shop was less than helpful, in all my 5 problems I had so that is another one I won't go to!
I used the dremel cut off wheel route. I ground the wheel down to a smaller diameter, which took a while as they kept breaking but I really didn't want it to catch the frame.
Once it was small enough I slowly put it into the hole and hoped!
The bolt was crap - really soft and the wheel went through so fast I nicked the edge of the eyelet, a shame, but no significant damage. The bolt was so soft that when I put the screwdriver in the slot it gripped easily and out it came.
I replaced both bolts in case the same thing happens on the other side!

Lucky... I broke a really really hard screw extractor in the last bolt I tried to remove- cue hours of dremelling........