Preparing the Source
The trick is to capture the release frame of the animations throwing gesture at the exact moment of its release. You can use a recording device to record the animation. Then step thru, frame by frame, determining which frame is the release frame. It is what I did.
You can set a ruler up-and-down and across to create a guide for placement of the “source” object. the Source object, if a Palette, can be easily moved to the show-site with accuracy by giving it a Moveable ability and an InitialOffset.