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Those tangs on the chainstays look like they could be a repair? Chainstays do tend to suffer in that area - especially if someone has re-spaced the dropouts?

Not so odd- if you were trying to keep this old stuff functional before the internet allowed the prospect of instant gratification of any 'retro' spare-part demand..

Why use a one-syllable word when a five-syllable word will do? That's my philosophy.. 😁 Well.. it seems this seat-post securing method might be even more sensitive to seat-post diameter than the method we're all familiar with, with its 0.2mm increments? One fix that was used on worn crown-race...

Imo that collet locknut ideally needs to have a washer placed underneath it- regardless of whether or not it ameliorates the falling seatpost problem.

Either the first two digits or the last two digits of the frame number will tell you the year it was built.

Imo if you are re-assembling with old balls it is worthwhile passing them through a micrometer and getting as close as possible to equal-size balls in any given race. The tight spot in my pedal disappeared when I did that.

Ah.. I just realised this is mid '80s, carbon fibre, and thus a bit beyond my experience. I will say that mid '70s SLJ front mechs had a lot more 'meat' in the clamp than a Nuovo Record, so one could probably be reamed out if it came to it... at your own risk. Dunno if that's what they did at...

SLJ & Retrofriction?

I once thought of using a short offcut of strimmer cable in this application- it comes in a range of diameters, between about 1mm & 3mm, probably runs to yet fatter diameters in the US? Obviously it'd be a "broken hoop" though.. probably wouldn't work. It's probably not called 'strimmer cable'...

Ok so it'd have been stupid to braze it! Unless it's an integral part of the seat lug there's obviously something in there- it's not just an 130-year accumulation of gunk? Maybe we can ask Nabeaquam to give it a bit of wire brush or something?

Now you probably do have the chops, judging from your threads elsewhere on here.. :)

Yeah I understand. Some mysteries might be too much of a gamble to probe into- especially after 130 years. A related mystery being whether the manufacturer intended the thing to be removeable/serviceable, either by them, or their customers? I dunno if I've nailed it Woz. That's just how I'd do...

I dunno if my drawings help anyone, or if they're an accurate representation of what's going on here? Anyway- here's another. It strikes me that if the collet assembly is 2+" deep, it may be (and have been) too long to get in or out via the bb? though I can see it's a large diameter shell by...

I know there's a locknut, (not in that photo.) I'm wondering if there's also a lockring or something in there too? The collet doesn't look to be more than about 1 1/2" deep. Do you think it's possible to get the collet out? or would you prefer to leave it in there, as long as it functions?

There's more than a few 123mm oln frames about- back then it was half-way-house so you could go 5 speed or 6. The only downside being that neither a 5 speed nor a 6 speed axle felt quite right in there until you tightened the qr. Is your bb shell 65mm or 68mm? Regarding the front brake, I would...

I think the crucial clue might be how wide the slots in the 'insert' are at the bottom: If the bottom was squeezed together, would it reduce its circumference sufficiently for the 'insert' to be withdrawn upwards? If the answer is 'yes' then chances are it was inserted that way originally and...

I'm going on this from p16, Woz. Your version seems to move the insert downwards to reduce diameter? If I've got anywhere near the way this actually functions, then the top of the conical bore of the seatlug forms a 'shoulder' on which, (until the locknut is tightened) the threaded part of the...

He's swanning around in a Porsche when he should be shining a light down his seat tube for us and showing us the business end of his locknut.. bloody typical! :) If that's a 1 1/8" diameter seat tube, then I'm guessing the seatpost is no more than 7/8", leaving 1/8" to fit all that gubbins in?

A collet so slim that it has to fit within the couple of mm available between the internal diameter of a seat tube and the external diameter of a seat post? I reckon you could install that from the top opening of the seat tube, you wouldn't have to do it from the bb. It may not even be...

Ah ok... 6mm seems to be a significant fraction of total stack to sacrifice though, especially on a machine presumably expected to support 20+ stone of human. Have you run this strategy past Caygill? ..not that there's anything inherently stronger about a high stack. Is that the edge of another...