The drawstring or gathered bind off is is the way we draw in some hat crowns and often finish stuffed animals, mitten thumbs and small bags. It's easy-peasy
LOOM KNITTING Cast-off Flat Drawstring Hack for Hats and Toys on Round Loom
How to Use a Kiss Loom - GoodKnit Kisses
How do I use my new 2 way regular gauge Kiss loom?
Modified Gathered Bind Off or Drawstring Cast off
The Gathered Bind-off — Woolly Wormhead
Gathered Cast Off or Bind Off on a Round Knifty Knitter Knitting Loom
Loom Knit Hat - Finish the Hat Flat - No Bumps No Wrinkles Decreased Bind-off Cast-off
Modified Gathered Bind Off
Modified Gathered Bind Off
Loom Knitting Cast Off - Stretchy Version
Gather Bind Off for Hats
How to Loom Knit Houndstooth In the Round