Set Screw Shaft Collars

Get some great, strong barbell/dumbbell collars on the cheap:

MCMASTER.COM

In the search box type in:

set screw shaft collars

A pair in standard size will set you back about 5 bucks, olympic size about $13.00.

All you need is a hex wrench, nearly every kitchen junk drawer in the country has one.

McMaster has fast, easy service.