How to extend a screw thread?

 From:  BEANZVISION
11740.1 
Hi guys,

I need some help. :) I'm trying to extend the thread of a screw to reach 20mm and am not sure how to achieve this. I tried to copy and paste the thread but cannot get it to match up perfectly.

If anyone can shed a light on it or able to do it, I have added the file to Google drive. I hate to ask but I just don't know how to pull it off :/



https://drive.google.com/file/d/1iu1tleD5zt9Pq3EAmiIet6GnaBZC44K4/view?usp=drive_link
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