Well, I have just shaved a measly 10 g off my Saint M810 rear derailer. To achieve that, I merely replaced 6 bolts to aluminum ones: 2 roller bolts, cable pinch bolt, and 3 adjustment bolts. No drilling and sanding, no lighter rollers, thank you.
This way it's down to about SRAM X.9 weight, but still beefier and more compact.
Does it count if I reduce cassette weight by removing sprockets? )
I just made a custom 6-speed one from Shimano LX HG-70 8-speed 11-28T cassette. The cogs are 11-12-14-16-18-21. Weight is 154 g without lockring. The rest of setup is Chris King Ti lockring 11T, Hope Pro 2 Trials hub.
krystian xtc, i like what you did with your WCS bars -18g great, my WCS seatpost/stem/bars look like they have 30g of lacquer & graphics on each of them so might well follow suit some rainy day (with dust mask & gloves + wet sandpaper!)
but not sure what you're doing with that seatpost, is 250g the "before" weight & 142g after? doesn't look safe at all to me
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