I have a DG300 that has two tubes fiberglassed into the tail along the verticle stabilizer hinge line. These tubes are roughly 1" in diameter. According to the book it is for tailweight. The manual does not seem to explain how to use this feature or how to secure the weights. First impression is a lead bar similar to the old window sash bars. But how do you secure them so they do not move around? Thanx for any light you can shed

John
DG300 "XLT"