Unable to join this bolt thread having cut it and added a segment but why?

took this bolt, cloned it, sliced it on the apex of the thread to lengthen the thread, moved it along the axis, joined the threads back up, intersect shows an apparent ok joint yet it wont join ?
approx 10mm dia bolt.3dm (2.3 MB)


Hello - you cannot join unless there are unjooied edges available. The objects are capped at the locations you are trying to join.



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Hi folks,

oops, I used boolean split, of course it keeps solids as solids. (never understand why it also keeps an original as well)