Hi all; Here's the sit: I'm writing a novel which involves colonization of other systems. I want to have a weirdo planet (thus the title) and I decided on a planet that doesn't quite complete a rotation. There's a thread here: https://www.physicsforums.com/threads/how-the-last-days-look-like-just-before-a-tidal-lock.790409/ that discusses it. Anyway, the point is a planet close enough to its primary to be subject to eventual tidal locking. This planet will be mostly solid, and will have a significant mass inhomogeneity that will make it act like an unbalanced bicycle wheel. At some point, the rotation slows down until it can't quite make it around on the last day. After that, it will swing back and forth through 350 degrees or whatever, every "day". So, two questions I'm interested in: 1) What would be a plausible range for the period of the swing, and how long would this state last until tidal forces finished locking the planet? I don't need rigorous math proofs, this is fiction. Just something that won't make the reader want to throw the book at the wall.