I would not do that, too big of holes too close to each other. and if you are using for brake cables there is a fair of mount of force, so my conservative self would be skeptical of gluing also.
many frames with cable clamps had thin pieces of metal brazed to the frame as stopper to help with the prevent cable clamps from slipping
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Last edited by squirtdad; 02-05-20 at 02:51 PM.