Shaw ride height help plz!

Well we race today and I just got the car together and starting to scale right now. On the rear ride heights it says measure from the top of the bird cage to the bottom or the frame rail... I don't understand that. I have TWM birdcages and it has a knuckle on top for the bearing. Do I measure from that??? Or do I measure from the axle tube to the frame rail?? I am extremely confused on this. There 50 different birdcages out there I would think the easiest way to measure it would be from the axle tube to the frame rail but it would probably be wrong.

just add 1/4" to the ride hieghts and measure from the tube .

Thx for clearing that up! Thats exactly what I did too. I got to thinking and checked out some cars on racing junk with shaw birdcages and figured that's what they were sayin to measure from. I was goin crazy trying to figure it out too. First time I ever took the car down to bare frame, rebuilt everything and scaled completely by myself. And my phone was out of service :(