The last two cogs are riveted to an alloy carrier because the last cog actually hangs over the end of the cassette body.
You may replace 8 out of the 10 individual cogs as they wear. This is essentially a loose cog cassette.Hardened, nickel chromed cogs and one alloy carrier reduce weight while creating a stiffer and more responsive cassette.That's why I ran 50-40-30 x 13-14-15-16-17-18-19-21 in the 8 cog era - low like 42x28 for mountains west of Boulder, CO 13-19 straight block for plains east.
On top of that you could keep gears like you have now for flat rides (same cassette in back, 52-42 or 50-40 large and middle with a Campagnolo crank, 53-39 with some one else's) without any parts changes depending on whether you felt like a flat or mountain ride for the day. I'd go for the classic look with used parts but YMMV. If you didn't care about being period correct you could get a new medium (like the racing-T) cage 9 speed (according to Campagnolo new ratio 9 speed derailleurs are officially compatible with 8 speed shifters) Xenon derailleur for $39 from ribble and Shimano front for $16. You could also keep everything period correct and bump the price a little ($16.51 from historic data, bringing the total to $96) for a silver Racing-T rear derailleur. You could accept that low x small cogs might not be usable and pass on the rear derailleur. Price with used parts could be comparable to a new cassette - the least expensive Campagnolo triple front derailleur on ebay sold for $6.50 + $5.50 shipping, crank $29.78 + $9.87 shipping, and rear derailleur $25.49 + $5.30 shipping or $82 total.
If you really wanted you could go much lower. 30x23 would provide a low like 39x30 which you can't get with your double and be like your compact riding friends' 34x26. Click to expand.You can get a lower small gear with a triple crank which isn't possible with SRAM and would take new levers with Shimano.
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