Do keep us posted on your useage of these Carlos, I am thinking of doing the same in the future to my '02 Boxcar. I had the Zimmerman drilled only from Vertex on my '83911SC and never had a problem. I have seen a set of drilled that fractured in track use and had assumed the shape of a lock washer. Don't know what happend to the car or driver but the rotor was presented at a Tech. Tactics seminar a few years back.
986geezer
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