Rotation (Haiku)

His knees buckle more than the wheels of his trolley,
Wheels can be oiled.
Old stock gets rotated.
https://www.reddit.com/r/OCPoetry/comments/98vwd6/in_your_arms/e4jsiy7/?context=0
https://www.reddit.com/r/OCPoetry/comments/98uj4h/uproot/e4jsoh1/?context=0