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https://www.ebay.co.uk/itm/193431229535
Wishbone stay Moser Leader AX. Don't see these come up for sale often, nice but pricey.
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I've been using this machine for about 3 years and it's only in the last ~3 weeks that I've had this issue which is what made me think it's a problem with the machine rather than technique. 15g is already down on my usual 18g dose and I did that before going coarser on the grind.
Interesting point about the light roast though, I mentioned earlier I had trouble extracting the El Oso beans which were a really light roast. I'm now on the Ethiopian Hambella which are also light. Prior to these I pretty much only drank the costa rican from YB or a local Sumatran that were both medium roast. Might see if I can get some random med/dark roasted beans to see if that's a factor, I'll try a pre-infuse too.
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Anyone had this happen and have an idea of the cause? When I start pulling a shot i'll get liquid through the spout then it'll slow down to a dribble as if I ground too fine. Coarsening up the grind helps a bit but you can see from the pic I'm already getting too coarse for espresso and getting weak extraction. When I take the portafilter out it looks like the puck has tried to climb out of the sides... in the pic it's a ~15g dose in a silvia basket and it's reached the top of the basket when it should be about halfway down.
My hunch is that it's the gasket not giving a perfect seal. When I backflushed a week ago I had some leak from there until I cranked the portafilter in really tight. I only replaced it 3 months ago so maybe it's a dud one. I also pulled the solenoid valve apart but it was surprisingly clean for such an old machine.

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Are you using a power meter or just a speed/cadence sensor and letting zpower work it out? If it's the latter then it can wildly over-estimate how much power you're putting out. Before I got my PM I used zpower to measure my FTP and it came out as 320W or something, my real FTP when I retested with a power meter was ~240W.
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I didn't get on with the El Oso. For whatever reason I couldn't get it to extract well, compared to the Costa Rican I usually get which always came out good. Just cracked open a box of the Ethiopia Hambella and it's spot on though. Don't usually go for African coffees but fancied a change and it's delicious.
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Brewing by weight is the best way to get good repeatable results. I wouldn't trust whatever the machine thinks is 2 cups worth when it doesn't know my brew method or the ratio I'm going for. It's worth doing things by weight at least the first couple of times to get an idea of what it should look like, then you can probably get by eyeballing it if you don't want to faff about each time.
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A shelf cloud apparently. Here's a slightly clearer version of that gif:
https://www.youtube.com/watch?v=CVgLeifDa8I
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The paint is also very very pretty. There is metallic shimmer in the paint, both in the white and Nakagawa pink paint. The white is like a pearlish white that cannot be replicated anywhere else but at Nakagawa in Osaka, Japan. There is just no way to recreate or replicate his pearl white or Nakagawa Pink without sending your Nakagawa bike back to Shigeru Nakagawa in Osaka to get it repainted.



The headset on this looks super bodged

