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I've never seen this posted on the board, but it probably has been. It is worth reading what official's manual says about ball side mechanic:
2.3.3 Ball-Side Mechanic:
A. General Provisions:
1. The use of a ball-side mechanic should be thoroughly discussed at the
pregame conference.
2. Ball and player location key the need for movement by the Lead.
3. The Lead should only move ball-side when the Trail is in the frontcourt.
B. Coverage:
1. When the majority of players and the ball are on the Trail’s side of the
floor, below the free-throw line extended, the Lead should close-down
toward the near lane line and may move laterally to ball-side.
2. Playing action may dictate that the lead NOT initiate movement – even
when the ball is on the Trail’s side – such as on a quick shot or a quick
drive to the basket.
3. Movement by the Lead across the lane should be brisk and with purpose.
4. Even while moving across the lane, the Lead must officiate players in
the post (PCA). Lead should not be caught within the key area except
when moving across or just briefly to view a play or drive to the basket
from the Trail side of the court.
5. When the Lead moves across the lane, the Lead’s PCA is extended to include
the area inside the arc. See Diagram 2-20.
6. When the ball moves inside the three-point arc, the Lead is now on-ball
and the trail must extend coverage to assist with the open area on
the opposite side. See Diagram 2-21.
7. If the majority of players or the ball swings back to the opposite side,
the Lead should begin to quickly move back across the lane to cover the play.
See Diagram 2-22.
8. If there is a quick shot or drive to the basket and the Lead is still on the
same side of the court as the Trail, the Lead should close down to the
near lane-line extended and officiate rebounding action.
9. If a transition to the other end of the court occurs when the Lead is ballside,
the Lead must remember to go back to the other side of the court
and into diagonal coverage.
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