I posted a pic of this awhile back but a vid kinda gives you a 360 visual.
The easiest way I've found to set double doors to eliminate cross legged jambs.
In an ideal world double doors would hang in this plane. The method isn't perfect, you still have to account for bowed or warped doors but this give you a solid idea of your starting points and how bad or in this case how good your opening is.
I usually hang doubles the same way I hang a single. After lasering the tops for height I'll set one side, usually the right, perfectly plumb. After that I'll rehang both doors and set the other side using the reveals. It's pretty foolproof.
I didn't use the jambmaster in this instance only because I was working in a completely finished house and dust collection on a collared router bit is pretty much non existent.
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