I was sure they said the cylinders were modified to accept the clips, but they were much faster than speed loaders since you just drop them in and close the cylinder.
I want to look into this because they would be great for my Colt Python. I would never alter the Python, because it's a Python and because it was my dads duty gun for years.
FReegards.
I'm like you are and wouldn't think of modifying Dad's gun. Call around and see if someone has a used or new, Colt Python cylinder, perhaps you'll get lucky and then modify that cylinder.
You'll enjoy these
http://www.cylinder-slide.com/Masterblaster.shtml
http://www.cylinder-slide.com/articles.shtml
http://www.cylinder-slide.com/pinwheeler.shtml