just came up with another mod works good too! All you need is a piece of lexan about an inch long, two small screws,and two pennies. First bend the lexan about at a 45 degree angle 1/4 inch
from one end then make two small holes to fit the two holes on the back of the chassis. Then screw the lexan to the back and tape two pennies or some other weight at the other end and you're done! One thing to note you cant steer when you're going forward and only a little bit in reverse.