Not sure if this helps or not - pics/link at the bottom of this post.
Adjust the sizing die by screwing the die
body down until it contacts the shellplate
and snug the lock ring. The decap assembly
should be screwed fully into the die at all
times. Fig 2.
htt** ://www.dillonprecision.com/docs/april-2015_dillon-die-instructions.pdf