Hi Chris,
The Front weight is designed to be used with a "short" lipo, like the hardcase IP or Vampire ones or the Turnigy / Zippy 87mm softcase ones that most people used up until they discontinued them this year.
There are such a huge range of lipo sizes and weights out there that it is almost impossible to cater for every one of them.
I have just looked up the specs for the TP 1800 and it is long and narrow making it the same weight as a "short" lipo. This means it does need a weight fitted to balance the car.
If you want to return the weight I would be happy to modify it to suit a 100mm long lipo for you.
I may need to look at doing a weight to suit this size of lipo in the future.
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