I recently tried one of these ProClips, and it works pretty darn well. Maybe iFly could start stocking these as well.
https://www.proclipusa.com/product/4-prong-richter-mounting-plate?sSearch=215058
4 Prong (Richter) Mounting Plate with Tilt Swivel
Item: 215058
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$34.99 USD
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I did have to use spacers under the ProClip to allow the 740b to tilt farther without hitting the panel. The only other issue with the Richter mounting is that the 740b has raised areas of hte case where the speakers are. Those are just under the edge of the mounting plate, so they keep the plate from sitting flat against the back of the case. I'm probably going to try to put some thick tape on the case to shim the low spots to stop the wobble.
Cheers,
Rusty