it's not a "mod" but it makes your bit goes in lightning speed !!! my bit became unbelievable it travels to 10 feet or more in less than 2 seconds " my measuration is not so sure because my floor is so slipy and my bit going abit not straight" !! it's soo super fast, as i wanted to be !! when it drifts the wheels start weeping and making this drifting noise, when i drift it makes this 360' turn and doesn't stop after that, when it jumps it does a 360' over turn "acctuly 180' because i have to turn it back always

", when you take over the cover the bit becomes in an "un-seen" mode !! extreme speed, this mod for all people who were diapointed of the bit speed ...
here is what you want :
1- 8.25:1 gears "not so necessary"
2- 3.0 motor
3- coton tips
4- WD-40
5- grease "the one that used for bicycles is prefered"
now, take off all the parts near by the motor and clean them up with the coton tip till it become totaly new and clean, put some of the grease on the following parts:
- where the tire axel contact the body
- the metal arm where the samll green gear fit
- some of the green gear
- the gear on the tires axel
- motor pinion
now take you bit for a ride then spray WD-40 on the same places that you have greased, careful not spoil your pcb or the tires " wipe your tires with a tissue" ... try your bit now !!