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That's the screw mark of the shower screen in the middle of the puck - do you need a bigger basket/dose down? Maybe not enough headroom for the showerscreen to do its thing effectively? I also found with my classic and an IMS sceen with an aftermarket
dispersion plate I had to back the screw off a bit to get it to 'shower' properly, might be worth pulling some water through without a basket and having a play.
kkg337-
That's the screw mark of the shower screen in the middle of the puck - do you need a bigger basket/dose down?
Yes it is but no I don't. I'm from the old school of thought where you don't leave a head of water at the top of the puck. Channelling is reduced by not leaving anywhere for the coffee to go.
Jonny69
Here’s an interesting thing. I had to replace the dispersion plate in my Gaggia Classic. I was warned about the cheaper ones because they have smaller holes than the original, which can cause problems. I’d planned to re-machine a cheap one to OEM size, but I thought I’d throw it in and see how it actually affects a shot. Most of the time it’s fine, but if you grind too fine and choke the machine you get this interesting quad channeling going on.