if you worried about the seal use some lucky 7 to seal it up - it's a sealant that's been designed by nitro users to specifically handle the corrosive properties of nitro fuel. As far as hitting the brakes is concerned try what chrobar suggested (there is a small grub screw on the opposite side of the throttle knob). You can also try removing one of the rear brake pads (it works fine with a single setup). If this is needed, you may want to consider some advantage racing fibreglass discs or some xtreme racing cabonfibre ones as you will only need one of these front and rear.