Even a 320 grit, if you wet it slightly, will leave a pretty smooth and clean finish. I have a home made aluminum polishing method / solution if you are planning on shining it up at all. Used it on my Fisher CR7 build in BO 13.
Yeah i found one of these too, never saw it before. They are huge!OK... I have only the top of the BB and the dropouts left to sand.
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I am also happy to report that I found an used "nexus auto D", which is an electronic automatic shifter for the nexus 3 bell crank type hub.
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It is bigger and heavier than I expected. It looks like the front bracket would attach to a kickstand mount... However I want to install it on my Felt Torch, (so I can have cleaner bars and less cables) which of course has an integrated kickstand. Luckily the brackets are bolted to the shifter so I can easily use other brackets.
I am particularly happy that it came with the shiny bell crank. I have a black one and wanted to replace it with a silver one.
I haven't tried if it works yet. I hope so.
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