Any documentation or guidance on how to use this plugin? (It installed just fine under SK8 on my Mac.)

If nothing it selected I get a dialog "Select the entities that will be the size and shape of the helix you want to create." If a line is selected I get the parameters dialog but don't understand their semantics - some values produce interesting results but I don't know how to control it. If a more complicated 2D entity is selected then I get more complicated results - or no result.