uniones - various methods of joining hairpin lace crochet - some a sort of cable using no extra yarn, others basic crochet stitches; just had another look - this is hairpin heaven! scores of detailed charts, pics on hairpin techniques & ideas.
How to Splice Yarn for Nalbinding - video tutorial. To join fibers that don’t felt easily, a Russian join provides a good splice that avoids those pesky loose ends. This video shows both the felted splice and the Russian join.