I put the free spin pawl in both of my vaqueros. It took just a little fitting with one, and absolutely none in the other. The instructions tell you exactly what to do; they're easy to read. Buy the part and install it yourself, if you're at least a little savy with tools.
Then again, unless you're cowboy action shooting, or doing something else that requires quick reloads, why bother? If it's a plinker or a hunting gun, you probably don't really NEED the chamber to line up with the loading gate, although it is kind of a pain in the arse when it doesn't.