I'm currently undergoing a drain install for the soon-to-be wet bar in my basement. I have the tie-in exposed (4" abs roughly 5" under top of slab) Picked myself up a 4"x2" whye to run a 2" line to the new bar sink. Just curious if anyone has advice on how to install this whye fitting to get the best connection. I have approx. 3 inches cut out of the existing 4" line i'm tieing into, and the whye fitting looks to be quite difficult to install without being able to move the 4" abs up and down. Any advice helps!