I have this curve with a screw modifier, but I cannot fill the caps in the bottom and top ends of my screw.
Geometry has to remain non destructive.
I can’t convert it to mesh and just add faces, because I need to maintain controll of how long/tall the screw gets.
Welcome 
…
uhhh… using only modifiers this is a bit tricky… you might use some “filled” face to use the screw modifier and also a copy of it to use the array modifier with absolute lifting in Z and using an empty with the same amount of rotation (or also use this for ththe lifting) like for example:
and the blend file:
UsingDifferentmodifier.blend (113.0 KB)
(Didn’t used a linked duplicate here which woudld be better 
)
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