Construction (SA #1)

Here is the first of hopefully a few small animations (SA)

So this one is incredibly simplistic but that's the idea, I created this a tad' absent mindedly while talking to friends on Skype and it came out mostly how I'd of liked, I wanted to add a slight wobble to some of the frames but for the life of me I can't remember how (without literally re-drawing it) so it looks a little... I dunno still?