Originally Posted by
Aubergine
I parked the Tandem in the shed for a few months but got it back out again to finish it off. After working on it a bit the last three days it is close to done. As should be obvious, the timing chain still needs some adjustment, and I think I need a half link to make it all fit. And the crank needs to be spaced a mm or so to the drive side. As it is, the front derailleur can’t pull the chain onto the granny. Otherwise it works pretty well for an old Tandem!
Oh, and the rear drum brake. I set it up as a drag brake. The two Mafac brakes are operated by the normal levers, but I mounted an old Huret stem shift lever and ran a cable from that to the drum. So going downhill, I can put on the drum brake and then modulate speed further with the regular caliper brakes.
A last fun touch is the Campagnolo 980 rear derailleur, to which I added a Soma long cage. It works pretty well!
You shouldn't need a half-link to properly tension that timing chain. That's what the adjustable bottom bracket device is for. And it looks in this picture as though the timing chain is too long. And also, note that the cranks aren't correctly set either for in-phase or out-of-phase.