Fits up to a 45mm (1.77") wide strap.

I use 5mm M3 screws and and 3mm heat-set inserts to attach the handle. Don't use screws that are too long and protrude through the other side of the spool.

Stick the tag end of the strap through the center slot of the spool, give it one or two wraps, snap the spool into the body and spin up the rest.

Secure the hook in one of the loops and that's about it.

The cavity in the spool is so they can be stacked instead of hung. I've included a simple puck so the bottom one sits level, too.