I think you've described the cause of the problem of your single-pivot calipers not staying centered & therein the implied solution ... i.e., simply changing the cable housing to one that didn't slide so easily through the braze-ons OR anchoring the housing by wrapping a piece of masking tape around the cable housing IN FRONT of one-or-more of the braze-ons should have kept the housing from slipping & would have solved the problem you had with the calipers not staying centered.
Yes, it all came back to me when I found the picture. Thanks.
Ok, in case anyone really cares (:p), this is the model I had some problems keeping centred; and it was more the rear than the front, for some reason. I bought them in '93 or '94, and the shop guy told me they were Chorus, but I could never tell
For memory, I think it was the outer cable that occasionally pushed the caliper across slightly to the right if it (the cable) moved in the old braze-ons on my old steel frames (pull outer cable from lever to caliper). Sometimes the whole cable would slide in the braze-ons, resulting in too much cable bewteen the caliper and the last braze-on, and I think this would put a little more pressure on the caliper. I always had the bolt very tight. I think I can see one of those spikey washers in there 😄
Damn! You're an idget! The reason you couldn't adequately stop is 'cuz you didn't have enough rubber on the road. It's obvious from the picture. It's no wonder that Australia is like New Zealand's retarded step brother.