I get how to use the helix tool (kind of) but haven’t been able to figure out the upright extruder tool.
Draw a face for the thread profile at the end of the helix select the helix and the face and activate the tool. You’ll have to either explode the helix group or open it for editing to add the profile.
Just a little demo of the difference between follow me and upright extrude.
Thread profile and helix:
After Upright Extruder employing The Dave Method as mentioned multiple times in this thread:
After deleting unneeded faces:
Make the threads long enough to extend all the way through the part with plenty to spare as described almost a month ago. Then use the process describe back then to intersect faces and erase the unneeded bits.