Chuckit, what would I do without you.  You will probably think this is presumptuous of me (and maybe it is) but I think I was one of the original proponents of these chuckits.  People used to stop me all the time to ask about this ball flinging thingy.  I discovered it in a an out of the way pet shop eons ago.  At that time I think they only had the long chuckits. That feels like a lifetime ago.  I got quite proficient at it (there is a learning curve).  Eventually the 18 incher came out and that became my go-to chuckit.  I have tried the smaller ones (I really should have stock in the company) but didn't like them as much as the 18 inch version.