After watching James Hoffmann discuss performance portafilter baskets (VST, etc.) I looked at my Gaggia Classic Pro basket under my microscope and was surprised by the jagged holes. Pictures & Mod in
VST Ridgeless Filter Basket - Precision Baskets for Espresso
VST Precision Filter Basket 20g – Right Side Coffee
Filter Basket - 58mm Group VST Double – Cleanskin Coffee Co
VST-cestas de filtro de café Espresso de 58mm, 15/18/20/22g, KEES Synesso, Slayer LM LELIT, cesta de filtro portátil para máquina de café a presión - AliExpress
VST Precision Double Ridgeless Filter Basket, 58mm Group