Indent is a neat feature, it worked for what I want to do.
It presented new problems, part1 has an o-ring groove, and when using
Indent, on part2, it put the groove on part2, which I cut away with a
cut/revolve. But when changing the OD of part1, the cut revolve was
not associated unless I used an equation.
Neat feature, should come in handy with a bit more experimenting.