RV30 worm gear NEMA 23 8mm shaft stepper motor used reducer for solar tracker ratio from Aliexpress

RV30 worm gear NEMA 23 8mm shaft stepper motor used worm reducer for solar tracker ratio 5:1 10:1 30:1 40:1 60:1 from Aliexpress Sleeve for motor shaft and worm gear input shaft The NEMA 23 or NEMA 24 stepper motor can&be installed with RV030 worm gear directly as the stepper motor shaft diameter is 6.35mm or 8mm, but the worm gear input shaft bore diameter is 11mm with Keyway. So the 6.35mm to 11mm or 8mm to 11mm sleeve is needed. #buyonaliexpress