Aluminium "glider" used on top of the ROTJ bunker detonator.
Approx 20mm diameter shiny aluminium glider. Recess on the back to accomodate for the V8 gear part. Needs to be glued as there isn't much material to drill and tap.
V8 gear part and alu knob under it on the 3rd photo are only to show what the assembly looks like and are not included.