I presented tutorials before for selfmade knitting needles and crochet hooks, knitting looms and hairpin lace looms, now I found a tutorial for selfmade circular knitting needles :))
Links:
Selfmade Circular Knitting Needles (DIY circular needles from dowels w/pics and tutorial)
Here at unikatissima:
Self-made Crochet Hooks And Knitting Needles
Make Your Own Knitting Loom
Self-made Hairpin Lace Loom