Originally Posted by
3alarmer
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...unless your ambition is to actually have a bike with the clamp on cable guides (which it might be, for all I know), it's often easier to simply buy or scrounge one of those under the BB shell plastic thingies, and flip the cable guide on the rear stay from top of the stay to below the stay.
Then you get the pull you want for the front, and the rear works fine, too.
You might have to drill a small hole in the BB shell in the proper spot in order to properly mount it.
https://www.bikeparts.com/BPC311115/...et-cable-guide
https://www.bikeparts.com/BPC326529/...bb-cable-guide
Those won't work on a PX10 or any other older bike that was designed for top of chainstay cable routing, unless you can route the cable through a space time wormhole and thus avoid going through the chainstay.
The RD cable stop needs to be on the bottom. Prior to the mid 80s, they were always on the top. Yeah, you could be a hack and use a clamp on cable stop for the RD, but that's an ugly solution.