Stand for midrange horns

Hi everyone!
So after years of having my midrange horn being aligned and supported with just books undeer the compression driver, on top of my bass cabs, I'd really like to build some kind of stand to put under the compression driver and horn throat, while being able to adjust them so that they sit at the right angle.
I seem to remember years ago seeing a thread or something about this but can't for the life of me find it.
I am using a JBL 2420 Compression driver and Azura horn, and they're sitting on a JBL 4560 Cabinet...
Any thoughts?
Thanks,
Byron