I just learned a new trix in x-stitching. Sometimes one cross starts in the same hole where the previous one ended. This happens e.g. when you stitch upwards (instead of downwards) and the rows are aligned. What you can do is to loop the thread around another thread at the back of the piece and then you can go back through the same hole again!
Why didn't anyone tell me about this? It's so simple. And if there is something I've learned in Engineering it is that beauty is in the simplicity ;) Fegurðin er í einfaldleikanum.