Be open to change. I have ALWAYS pressed to the side when doing a D4P so they would nest. Then on this latest project, for some reason unbeknownst to me, they won't work and after ripping out some more than once to get that "perfect" match, I gave up and tried one pressed open. Worked and so I finished the rest doing it that way. The only thing I can figure is that I haven't been starching the limpness out on these, no other explanation that I know of. So I do what works for the current project.