I noticed on my new tr arena today sparks from underneath on acceleration. On inspection the spur gear is hitting the chassis at the rear of the opening only slightly. All bolts are tight & nothing is bent as it is new & has not been jumped or crashed. Does the chassis flex that much? I was thinking about buying the alum. center brace , but is it stronger than the one on my RTR or is it just "bling" ? I guess i will prob. dremel just a little more clearence. Any ideas ?