Revolute Constraint - update distance between bodies

[commadore65]

Hi, I'm a bit new to this and was just playing around with the P2 Revolute Constraint example. 
http://phaser.io/examples/v2/p2-physics/revolute-constraint

I was hoping someone might be able to advise on the best way to update the distance of constraint.

Is it just set once it's been created or can I change the gap between the two bodies on the fly fairly easily. 

Any advice would be very helpful/welcome.

[commadore65]

I've managed to find the right thing to tweak. It's change the pivotA from the update loop. Added this into the update:
 

constPiv = constraint.pivotA[0];

constraint.pivotA = [constPiv-0.25, -2.5];