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very good point, I don't have my cranks to hand and had forgot about the axle being exposed on the other side! Softly softly approach should do the trick. Do post up your results when its done :)
TotalShanner-
that´ll be one for next weekend though; work calls so i wont be fizzying off anodising this weekend unfortunately..
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In catching up on past achievements, I remembered to respond to you again.
Thanks, it worked a treat.
Ended up having to make a paste off the pellets because the solution wasn't strong enough, apply liberally with brush and have that fizz the anodising away over a couple of hours. Satisfying.
Rodolfo
Beware; the steel axle is also visible from the drive/outside, the dark gray ring as per image.
As tester pointed out this interface is only pressed, so get any caustic soda in there it'll dissolve the aluminium round the axle which you don't want.
I believe your method with the brush to be quite smart and will use it in conjunction with wetndry where I don't want the caustic soda to end up.