Personally, Mr B, I wouldn't touch it with a barge pole:- A couple of mates have bonded Alan aluminium cx frames from the 80's; in time everything becomes "tired" and the bonding between the tubes and lugs begins to fail - yes it might seem ok now; but for how long? The mis-alignment could even be due to someone attempting to re-bond a tube into a lug and getting it wrong? Plus, unless the bike has been dissembled regularly and re-assembled with plenty of copper slip, the rear mech, the bottom bracket bearings and headset bearings will probably be bonded into the frame. A third mate, a very skilled tool-maker / fitter in the aerospace industry, bought a secondhand bonded aluminium Peugeot. Having given the rear mech mounting bolt a good soak (submersion) in anti-seize oil, his efforts to remove the rear mech mounting bolt resulted in breakage of the ( non-replaceable ) mech hanger from the drop-out. Also, with age, all aluminium can stress fracture without warning.
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