HKFF

Hi, I have the feeling after reading this uplifting forum that it is quite clear how to make this 6ft-stopper dissapear. But does anyone can explain how to create a new and safe stopper around 3ft, so that the front lens doen't fall out!!! A screw????... If anyone has pictures or videos that I could use as a tutorial for this operation, that would be very useful, time and money saving!!! best regards HK