Changed out the nylon motor gear in an E70 X5 transfer case actuator.
What a c**t of a job on the ground, with basic home garage tools.
1. Move heat shields out the way to gain access
2. Drop cross brace as there's still not enough access to the E10 bolts
3. Remove worm gearing from actuator to remove E10 bolts
4. Curse a lot while getting to that last E10 bolt
5. Cuppa tea to cool off, and begin to disassemble actuator casing
6. Soak in WD40 to help split press casing
7. Curse more as pocket knife which would've been perfect to split casing is in E91 with your partner across town
8. Finally get it all apart, replace nylon gear and reassemble
9. Curse some more getting all the fiddly bolts back in their fiddly holes
Highly recommend only going ahead with this if you have access to a hoist. Otherwise budget around 4 hours for as many cups of tea as it takes to not throw it across the room.