Brass rod could cause some problems. You'd have to snip it with some pliers and what this does is give a "squished" point to the end of the rod, which wouldn't looked like an expended cart. I'd use some plastic rod from a model shop, it's easy and quick to cut with a scalpel, with give nice clean cut to the edge, and is alot cheaper than the brass rod. You can get it in 1mm diameter which would probably do the trick. (maybe a smaller diameter would be more in scale).