I have also used a bit of blutak in between the plastic shell and metal rod to increase slide resistance (good enough to restore it to back-as-new state). It works wonders and there is absolutely no visual change.
Cheers!
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Desktop system: M-Audio SuperDAC -> Graham Slee Solo | Creek OBH-21 -> [Headphones]
Speaker system: M-Audio SuperDAC -> Cyrus 8 -> Quad 12L
Headphones: AKG K20/K145/K240 Sextett/K340/K401/K601 | Beyerdynamic DT-880 | Grado SR-60 | Sennheiser HD 25-1 II/HD-600/HD-650
Portable system: Apple iPod 5.5G -> Meier Corda Move | Microshar uAMP107B -> Etymotic ER6i
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For Sale: Microshar uAMP107B
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