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Recently I opened my AZ-EQ5 mount for adjusting and greasing. I did not find any complete tutorial for this nor worm or bearings dimensions. I plan to replace some of those if I have the chance. Meanwhile, I will add some pics of the disassembly process. Open the plastic top case. Please excuse the USB hub attached, I did not remove that. Pull out the cable connectors. Put the top case with the controller board aside. The bolt inside the green circle can help you remembering or adjusting the belt tension. Loosen down the RA motor screws. Remove the belt. Unscrew the bolts. Remove the motor. The bolts inside the green circles can help you remember and adjust the worm distance to the RA main gear. Remove the bolts holding the worm case. Parts: RA main gear, worm case. Remove the screws holding the encoder board. You get access to the nut holding the worm in place. Remove this too. Remove the bolts inside the driving gear attached to the worm. Sorry, not the best pic. You can now proceed to push out the worm and the bearings. No pics for this, sorry. The bearings are 688Z, 16mm outer diameter, 8mm inner diameter, 5mm width. Worm dimensions measured with the caliper: 69mm, 36mm. Hope someone finds this useful. I'd be interested if the worm is identical to the ones used in the HEQ5. Clear skies! Alex