If you have an advanced F16 Juan and your nose gear is collapsing you can fix it. I had problems with mine collapsing I just modified it and now it will rip off out of the plane before collapsing. Many others had that same problem. All you have to do is regrind the flat spot on the pivot shaft that retracts/ extends the nose gear drag link to give it more travel when it extends. It'll put more pressure on the drag link in the down position and will make it virtually impossible to collapse.