Originally Posted by PilotFishBob

Went through this myself recently. With the RD over the biggest cog and the chain threaded and draped over the chainring, I pulled the chain ends just taut and then removed two links and connected. Some sag in the smaller cogs, had to set the cage tension spring a couple of notches forward to give some extra pull in the smaller cogs. I had also adjusted the pivot spring a bit tighter. PITA but it actually shifts pretty well, surprisingly enough. This article at Classic Lightweights was helpful too: https://www.classiclightweights.co.u...nce-adjustment.

His tensioning method is different and probably works better than mine but I came out okay in the end. I usually go the subtractive route, easier to tighten by removing links than having to loosen by adding back in. The chain / RD threading is totally counterintuitive, being used to modern derailleurs it made me nuts - but it works. I'd note that I'm using a single chainring - you're using a double so that may add issues I didn't run into.

Here's a pic of my rig: