Roadblock?

This is a short & free-flowing entry.  Please forgive the lack of coherence.

I was getting some writing done the other day and hit a roadblock, which can be annoying when dealing with the 'universe' of a book.  I was working on chapter 7 when I stopped mid-sentence.  I realized that something that is very important to my book was never hashed out in my outlining.  More specifically, it is a piece of machinery that I never came up with a shape or design for.  I just had a simple idea in my head and never hashed it out.  So now I am at a roadblock until I can describe this thing.  I really can't make a place-holder either due to the mechanics being interlaced within the story.  It seems I need to get this thing figured out so I can continue.

I did pull out a piece of paper and tried to sketch it out but I suck at drawing and my first 'design' doesn't look like how I want this thing to go.  My new goal is to figure this whole thing out and get the logistics working as quick as possible.

Don't you just hate roadblocks?!?!