Bar - don't know yet, trying to get a Radar Lock too. So it would depend on how to decide to drill both of them.
Long Roller's drill is one I'm considering. Although people have to remember that with my low inverted track (4 3/8 rt, 5/8 down) that a drill like that reacts slightly different for me!
Also have to consider how my Terminal and Max Velocities and Orbit are drilled as well as my Changeling that I use, and thinking about getting a Supreme Justice Pearl from dstanek on here.
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Semper Fi! AMForce Rocks!