Managed to get rid of the Specialized Mindset headset too. Previously it was poor quality caged bearings that sat in integrated cups in the frame, with additional races that sat on the crown race and beneath the split ring at the top. After lots of googling and a but of guessing it turns out you can ditch the caged bearings and extra races and just drop two Cane Creek sealed 1 1/8th cartridge bearings straight into the frame. It does need an additional 2mm 1 1/8 spacer above the top split ring, but under the headset cover, as the top cup is quite deep and the bearing is recessed. All successfully sorted.
Managed to get rid of the Specialized Mindset headset too. Previously it was poor quality caged bearings that sat in integrated cups in the frame, with additional races that sat on the crown race and beneath the split ring at the top. After lots of googling and a but of guessing it turns out you can ditch the caged bearings and extra races and just drop two Cane Creek sealed 1 1/8th cartridge bearings straight into the frame. It does need an additional 2mm 1 1/8 spacer above the top split ring, but under the headset cover, as the top cup is quite deep and the bearing is recessed. All successfully sorted.