Here is a wee short video.
You can see more photos of this marble chaser on my etsy shop. Galen (my handy dandy hubby) has made quite a few marble chasers, all sizes ~ small to really, really big! We sell the small ones on etsy because the shipping is very reasonable. The large ones get too costly to ship so we usually sell those at the fall festival here in our town. But if you're interested in a large one, let me know. You can also see more here.