Update: The HK 1.25x is well built and works like a charm. It is a fraction of the cost of a Leica brand 1.25x. It comes with a small leather pouch which attaches to your camera strap. My only complaint is it sticks out from the body a little more than I'd like, but I can deal with it.
I use it for my 50.
When I want to use my 35, I just take off the 1.25x for 0.72 FOV.
Thanks to all who replied, especially Pinholemaster, who gave me the idea : ) hugsz!!!!
Will the 1.25x magnifier fit on any M-series Leica? An M2?