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Yet another low-cost leadscrew coupling by keegi is licensed under the Attribution - Share Alike - Creative Commons license.
© 2011 by keegi
Instructions
* slide the tubing on 5mm motor shaft
* thread one nut (or better yet, a coupling nut) onto the top of the tubing so that half of the nut is above the shaft
* thread another nut onto the threaded rod
* screw the rod onto the nut on the motor
* tighten the rod against motor shaft (but not too tight)
* tighten the nuts against each other
I used coupling nut on the picture for better grip, but it seems to work with regular nut as well.
I don't see a reason why this shouldn't work for 5/16" threaded rod as well.