These links work any better for you?
2" to 1.25" adapter with T-thread
https://www.bintelshop.com.au/Product.aspx?ID=7472
Canon T-ring
https://www.bintelshop.com.au/Product.aspx?ID=5551
You screw the t-ring on to the adapter, click the camera onto the t-ring exactly the same as you would a lens, then slide the adapter into the focuser, and tighten exactly as you would with an eyepiece.
Wrapping the strap around something is optional, but does get it out of the way.