A holder for the bearing and a holder for a 8x1.5mm spindle. The bearing is no longer a floating bearing. You need a new flexible motor coupling, 2 nuts (steel), 0.5m spindle, one nut (RG7),a few M5 nuts and screws. No need for drilling, milling ... http://e3d-online.com/RepRap-Spares-Mechanical/Flexible-Coupling-5-8 http://www.metallbau-pietrzak.de/shop/product_info.php/products_id/5897 http://www.metallbau-pietrzak.de/shop/product_info.php/products_id/5306 2x http://www.metallbau-pietrzak.de/shop/product_info.php/products_id/5350 change the z-axis eeprom setting to 2133.33 The original bearing is between the two steel nuts