John,
As far as I know, Stronglight 93 cranks were never anodized from the factory, always polished bright. Subsequent models from the mid 70s on such as the 104, 105, 106, 107 and so on were anodized.
If you have access to a buffing machine or a grinder with a buffing wheel it makes the job of polishing corroded 93 cranks a lot easier.
Remember the 5' rule: the job doesn't need to be perfect for a rider, just look good from 5' away.
Chas. Colerich Oakland, CA USA
Jon Spangler wrote:
> I've been looking at buying a used Stronglight 93 crank set for my Allegro build
> (or for a potential Peugeot PX-10LE if I take a trip down memory lane)
> and have been wondering how to evaluate and/or treat corrosion on the cranks.
> How much corrosion or pitting is too much for safety? For successful polishing or re-anodizing?
>
> SL 93s often show up on ebay in varying condition, but my cash is limited, so auctions like this are attractive initially:
>
> 130378915252
>
> http://ebay.com/
>
> The recent thread on polishing prompts me to ask whether it is possible and/or practical to refinish (re-anodize)
> a crank set like this, and how many irregularities and/or how much corrosion can be tolerated or dealt with in such a process,
> if it is possible at all.
>
> What are my options with used Stronglight 93 cranks?
>
> Regards,
>
> Jon Spangler