Torpine R21 shorty LiPo holder set
New from Torpine for the ARC R21 is this shorty LiPo pack mount made from brass. Weighing close to 80g in total, each side is attached with 3 screws and can be finely adjusted to fit the shorty perfectly. If 80 grams of brass is too much they have also released two additional weights that mount directly to the motor mount with one weight (8g) on the right and the set of two weights (2x6g) on the left. The threaded holes for fixing the weights are already in the motor mount by default and the weight on the right has the thickness to serve as the inner stop for the LiPo.
Source: Torpine [torpine.com]