Help! Alt arm switch

I need to swap out the arms from a BT Alert with Alt Ricochet.
What is the best technique?
Should I detach the entire wheel/arm assembly at the car, if so, how do I do this without breaking the joint.
Or should I pull the pin that holds the wheel itself to the upper arm.
Neither looks like a great solution to me.
What is the best technique?
Should I detach the entire wheel/arm assembly at the car, if so, how do I do this without breaking the joint.
Or should I pull the pin that holds the wheel itself to the upper arm.
Neither looks like a great solution to me.