Had a problem, and found a solution. So I'm posting this because I'm sure someone will have the same problem and would be interested in how to fix it.

So I decided to wash my bike. I took everything off that I could and gave it a good wash. When I was putting the bottle cages back on I got a little too enthusiastic and I snapped one of the bolts holding on the bottle cage. Stupid, I know. The bolt was snapped off deep inside the hole and so I started looking on the net for solutions. I found advice like buying special drill bits, drilling holes, and re-tapping threads. I think this advice is rather generic and would work well on something like automotive bolts which are very hard.

But the bolts for a bottle cage are rather soft in comparison. So what I did was I got a cheap jewelers screw driver and gave it a few taps with a small hammer to drive it a tiny amount into the exposed face of the bolt. Then I was able to use this to loosen the remains of the bolt just enought to be able to move it with a pair of needle nose tweezers.

I ruined the tweezers but got the bolt out. Now everything is fixed and I am happy.

I'm sure someone else has either done this, or will soon. Just thought someone might like to know how to fix this.

Of course I have learned that bottle cage bolts only need to be finger tight, not gorrilla tight.