I recently purchased some vintage 6-speed Shimano 600 downtube shifters. The package came with all the parts in a ziploc bag and it looks a bit bewildering. Any idea where I can find an installation diagram for this assembly?
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Originally these levers came with three parts per side - the concave bit that goes on the downtube, the lever and the screw to hold it all together. The concave bit only goes on one way - turn them 180 degrees if it is not screwing together. And that should be it, see:
But you have them in pieces. You need these instructions:
The way they are set up is:
The Shimano Techdocs site has installation manuals and exploded diagrams of Shimano components. While it's possible your shifters may not be on the site, you can probably find a set that's similar enough.