Help! I have a merv and just bought dual batteries and a series connector. I read you have to change the pinion gear when running dual batteries. I removed the motor and esc as instructed. When i tried the supplied 1.5 mm hex drive the set screw stripped. I then tried a 1.6 mm hex drive and this seems to fit, but it seems that at the factory they applied to much locktite. The screw will not turn at all no matter how hard you turn. Please help me find a way to remove the pinion gear set screw without stripping the screw. Thankyou.