The good news is I remember parts that are named after pastry.
Download the
www.solidworks.com/FIRST kop
In the Kitbot folder you will find churo 3375 and 15750. There are also two assemblies with mounting holes/screws.
Open churo 3375. Save the part with a new filename. AM created the original in native SolidWorks format so you will be able to easily modify the sketch. Edit the sketch. The sketch has a few key dimensions. Change the hole diameter 1st to .2. Add a construction circle around the hex to create a diameter. That way you can control the dimensions easier.
Marie