Hi I gust installed the zenoah g320 in my losi dbxl.... I come to find out its 1.1cm wider crankcase.... well I had to shave some plastic off 5he center short shaft mount as well as sanded a little off the crank case to achieve proper gear mesh .. Now the drive cup on the center short shaft has maybe 1mm clearance between it and the engine.... now should I grind a little off the case to increase this clearance... or get a bigger pinion...