You replace the front brake lever perch with one that has the light switch mounting hole made into it, like the CB350, or Twinstar had. I found some on ebay when I did this to a friends CB160 a few years ago. I did use a new switch from Honda in it though. Then I just wired it into the brake light circuit. You cannot tell it is not original to the bike.
That's basically what I did. I used the bottom half of a K7 switch, had to polish off the black paint, and swap the starter button over, otherwise it was a direct fit onto the K4 top half of the switch. Aftermarket front brake cable didn't have the in line switch, I didn't really like the idea in any case, but didn't think later switchgear would be compatible with the CA95.
Fascinating stuff, that cable switch! A pity the aftermarket versions didn't have 'em. I'd love to see that incorporated into other cables, just to clean up the handlebars etc. I mean, I got spoiled by my '69 CB100 with the bars wired internally, and will likely even wire my CLIP-ON bars for my "CB900K0 Bol Bomber" even if it's only for a couple of inches. But think of all the places where this might be adapted - the CLUTCH cable perches have switches to engage the starter & the neutral light etc, but let's say somebody wanted to "RETRO-FRY" a later bike whether that's a "board-track" or "Cafe" or "Steam-punk" or whatever - they might want to use alternative controls whether that's levers with the pivot at the distal end of the bar as in the "Steampunk" version, or just a "street-fighter-er" mod with a CB750P style siren lever connected to the rear brake via a Z1R style remote master-cylinder etc - All of the crotch-rocket stunt-bike people do it - Which would also be useful for a HANDI-CAPABLE retrofit as well! In any case, if the brake is hydraulic you'll want the banjo-bolt actuated switch but only where it's least visible 'cause again that's a MODERN feature. IMHO there are many many applications for a cable switch such as the one shown above.
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