Yep you need the base as that’s what the cutter bottoms out on
Found that out the hard way 2
I have one and still use it with one case I then put that trimed case into the Lyman and
Push the cutter up against it as a quick and easy way to set trim length
I don’t like using a drill with the lee cutter as I find it cuts quite rough and requires alot of tidying up with the chamfer tool
So I cut the single case by hand than use the Lyman from there on
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