That sounds easier than the way that I did it! I got a TB syringe (fine guage, long needle) and went to stabbing into the rock in the areas that they were. I paid attention and stabbed in the same place that they withdrew into. (I used the boiled DI/RO water mix.) I do not know if the mix just chased them down the hole or the needle injected it into the bodies, but it was very satisfying to do it with a needle!