Russell Optics finder diagonal

I know a few of you have posted information about replacing the stock diagonal that comes on Russell Optics finders. If you could give a quick description of what it takes to swap it out, I’d appreciate it. Looking for a little more aperture and the 12x70 Russell looks pretty good at this point, not to mention the price is right.

Thanks in advance,

Jay

I am using a Celestron 1.25" prism diagonal in my 12x80mm Russell finder and it works fine. Just remove the old one and slip in the new one.

Attached Image: