I have a "Frozen stem", Aluminimum Stem corroded and stuck in a Steel frame on an old Threaded Headset.
I'm trying to pour Ammonia down the Forks to slowly eat away the Aluminium Oxide But So far I have failed to get a good seal at the Stem Bolt Hole and the Ammonia just leaks away.
So far i've tried:
- Blue-Tac: I think the cold and metal conspire against it to stop it sticking
- Cork: I tried to whittle down an old wine bottle Cork but Its difficult to get A tight fit into the Bolt Hole without any gaps. The bolt hole is only recessed about 5mm
- Candle Wax: I stuck a bit of wax down and then tried dripping hot melted wax around it to melt a plug but it still leaks.
Any other suggestions? - what do people use for this kind of thing?
Secondly- I'm using "Cloudy Ammonia" that I picked up in the Supermarket in the Laundry section. Is this going to be a high enough concentrate?
I think it said 20g / Litre? maybe..