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@jaymsd
I hope so, doesn't seem to be eroding it away just yet but the blackness and bubbling looks positive nonetheless.
Don't have a way of getting videos on here but I've taken a pic and attached it to my last post so hopefully that helps someone. It seems pretty simple though. Stick water in a pot (Carte d'or ice cream pots seem to be the ideal size for this!) and then put in caustic soda at the ratio on the bottle then stir it up and pop the frame in the tub and let it go to work!
If this does work it definitely seems like the easiest and cheapest way to get out a properly seized aluminium bb from a steel frame!
Now that I've said this I'm going to go back out there and the bottom half of the frame will be gone! haha