I lurk here frequently, mostly to see the artistry so many of you bring to this craft. I"m not a builder unless you count a CVA caplock Kentucky I built when I was 14, back in the 1970s. I admire those who have "the hands." But I am a writer and I know what it is to have writer's block -- and when I have it I'm reminded of an inventor with hundreds of patents I saw interviewed on "60 Minutes." They asked him about his ideas and how he came up with them and his response was, "Sometimes, I sit and thing. Other times, I sit and think about thinking."
In other words, take a brief rest, do something unrelated, and come back to the task at hand. Blocks come from being hyper focused, which causes a loss of perspective.