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Want to run full length outers - better to drill out or mill off the ends of the guides - erring on the side of milling as it seems less accident prone
Small engineers file.
will take days!!
I've drilled them on several frames but you normally need a long series drill.
Clamping the frame for milling would be awkward and possibly more likely to cause more damage than opening up the guides
You must have a pretty impressive milling machine to clamp a frame in it!
Milling runs the risk of damage when you clamp the frame and will always be visible. How about using a Dremel, you get the speed with a similar result as drilling or filing.
will take days!!
If you're a softhanded office worker maybe. 😉
I use these on the Airborne
[url] http://www.swinnertoncycles.co.uk/M-Part-Top-Tube-Disc-Cable-Guide-Set.aspx [/url]
^ needlefile and a pot of MTFU. 😀
File works fine for me but otherwise drill it out to just fit shimano gear outer and it'll still work with split outer routing if you want to revert.