Thanks again Michael, much appreciated!

Did you need to re-model the thread from scratch for this to work, or can I somehow use FlowExtend on my existing thread? I downloaded FlowExtend now, but I don't understand what it does.. It added a lot of flat planes to my model when I tried to use it on my edges (see screenshot)?
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BTW, is there a way to add a shortcut for "Reset Current view"? I only found a script to "ResetAll views".