Originally Posted by wollow86

I'm going to try to make a mould of the bumper and pour lead straight in there to remove some of the chassis weights from above the battery.

I just took one of my extra M05 bumpers put it in the freezer for a few hours then misted it with water, so it had a frosty coating. Then I melted down a 55cent lead automotive battery clamp in an cut in half pop can. Then I poured in the lead, the steam from the frozzen water mist in the bumper did not allow the lead to stick to the plastic bumper. I quickly dropped the whole bumper into ice water. It worked way better than one would think.Popped out the lead weight, filed in the chassis centre grove, dropped it into a fresh bumper.Works great. Very cheap and easy to make.