A quick look inside the Bosch GWS 20-230 JH angle grinder - YouTube
Buildalot Specialty Carbon Brushes 1128X_Bosch_GWS 20-230 H for Bosch GWS 20 -230 H Powertools - With Automatic Stop, Cable and Spring - Replaces 1.607.000.480 & 1.607.014.171 - - Amazon.com
Metal Gear Set for BOSCH GWS 20 180 / 20 230 Angle Grinder|for bosch|angle grinder setangle grinder gear - AliExpress