Old-Style Group Head Portafilter Gasket Shim Thin paper shim used to raise the profile height of a group gasket when portafilter or inner-group wear causes the portafilter handle to engage past the six o'clock position. SPECIFICATIONS 66 mm O.D. x 57 mm I.D. x 0.75 mm thick Paper material COMPATIBILITY Works with: old-style group head assemblies where the group gasket needs added height to correct portafilter alignment INSTALLATION Easy DIY fix, stack the shim behind the group gasket during a routine gasket change. PRO TIPS If your portafilter handle now hangs well past 6 o'clock when locked in, that's the telltale sign of a worn group gasket that this shim is designed to correct, check gasket thickness before adding a shim.