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This is a torque-limiting component. When one side is prevented from turning but the other side is forced to turn, the inner piece comes out of its "click location" and into the next one. It requires quite a large torque before it activates. You will not be able to generate the torque just by turning the two components with your bare hands. To see ...


Step 45 of instructions for 42100 set shows entire drive-train for one side of the tracks before it is being covered with some panels and beams. I've taken that image and have drafted a rough path between the motor and Tread Sprocket Wheel that will then transfer this motion to tread links. As you can see Clutch is within this drive-train, so it makes clear ...


These are from 42098: Car Transporter Key parts 24116 - Technic, Panel Curved 3 x 5 x 3 in Blue and Light Gray 15458 - Technic, Panel Plate 3 x 11 x 1 in Dark Azure


I haven't tried creating my own parts. However, I've seen that Bricklink's PartDesigner is quite popular in the community. It looks like the creation process is quite streamlined, you can edit the connectivity info of each piece, and it plays very nice with Bricklink's Studio.


Motor is only being used to operate the crane, not to drive the model. So driving/pushing shouldn't be blocked at any time. I suspect there will be an issue with position of differential - if placed incorrectly both axles will spin opposite directions. And if placed on the ground the model will simply not move. Check steps 169 and 268 in instructions booklet ...

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