CHECKING THE COMPONENTS
Only after noting the exact orientation of the motor arm and linkages (a photo helps), should the motor shaft nut be removed. … so I bought a new motor and also a new link assembly, rather than risk those ball joints failing and having to do the job again. Then the three bolts holding the motor can be removed and the motor detached from its base plate (part of main linkage). The new motor’s bolt holes are not threaded, so each bolt is screwed in and out to cut the thread before fitting to the mechanism.