ULCS Ball Adapter for Ikelite DS200 in Lights, Strobes, and Lighting Technique Posted July 2, 2006 For anyone using Ultralight arms and Ikelite strobes, how do you attach the ULCS ball adapter to the strobe? I have an Ikelite DS200 and the ULCS AD-200 ball adapter that has a flat washer (next to strobe) and a lock washer (next to the adapter). The problem is the lock washer cuts the o-ring on the bottom of the adapter. After I used this set-up once the o-ring was cut clear through. Do you forget the o-ring or the lock washer?