I have recently found that the turntable of the crane has been sticking when turning! Having taken apart the crane and investigated the issue, it seems to be the interplay between the turntable's teeth and those of the small black cog: they are not meshing smoothly! The cog moves nicely when turning the turntable, but is stuttering and jamming the other way round (the more useful way)!
Any help would be appreciated!
P.S. any tips on lubricating the yellow pistons?