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interesting that you say they cant be scratched, cause my hieght adjustible half aluminum knob has got lost of scratches on it. Bought it used. The scratches are in the form of black lines as if the knob is made of steel and then painted silver.
I think they are infact made from steel or another heavier metal... The knob is way too heavy to be aluminum.
I may paint it later to touch it up a bit and make it look new again.
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