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Hi CfellowsJust glue in an already threaded sleeve, then you can cut the douple start thread on the lathe. (use the compound slide parallel to the lathe bed and then move it half the pitch when the first thread is finished) And I guess it would be best to also thread that sleeve on the outside, this should increase the strength of the bond (A thread has more surface than a simple sleeve)Florian
http://www.modelenginemaker.com/index.php?topic=7288.110It's in my Levin thread page 12