Hex Mounting Nut for mini quartz clock movements
This hex nut is tightened down over the hand shaft to hold the movement into the clock. Don't overtighten, just finger tight and then a nudge with tools. If it's too tight the movement might run slow or stop. If this happens just loosen this nut and test again.
We include hardware when you buy quartz movements from us. You don't need to order them unless you want spares.
(Legal disclosure: The dime is only for size comparison and is not included)