Mounting under-BB-shell plastic guides
On a bike where I think I should resort to passing shift cables under the shell, I keep seeing references to "Shimano Bottom Bracket Cable Guide SM-SP17" or equivalent:
LINK But I see some come with no hardware, some come with a sheet metal screw (ugh!) and there are references to an M5 bolt. In some instances I've read of an insert that goes inside the shell (I presume designed to stay clear of bearing cups, etc.) And electing a particular model # during searches does not ensure a purchase means one will get anything other than no hardware or the sheet metal screw. OK, time to "make it right". I would imagine am M5 button-head bolt is not all that hard to find (of course, I'll end up with a bag of 25, and thus 24 left over
). So (a) what would the insert look like, is it possible to make one; I'd presume a nut is too small so now we're talking a scrap of metal shaped to fit, and then drilled/tapped, or (b) isn't the BB shell thick enough to drill and tap directly? Or, of course, if someone else makes a better one...
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Larry:1958 Drysdale, 1961 Gitane Gran Sport, 1974 Zeus track, 1988 Masi Gran Corsa, 1974 Falcon, 1980 Palo Alto, 1973 Raleigh Gran Sport, 1974 Legnano. Susan: 1976 Windsor Profesional.