It is located 6 3/4 from the PIN and HART at 90 degrees. (The Dot in the HART is its locator pin.)
The No Mercy is a dual plane design meaning there is a Mass Bias on either side from this point. Just use what ever side benefits you most for your desired layout. Generally thought it not recommended to layout a No Mercy, not using the HART. Just remember even though your not using the HART I'd try to get it in the track. Maybe the bottom of the ball.
You might run you layout past someone at Hammer.