Paint Bottle Holder for Paint Shaker

This is a pretty niche product; I tend to get hand me down paints and purchase used sets off ebay so I ended up getting one of these mixers instead of relying on elbow grease...

These two assemblies are made to replace the strap on the Robart Manufacturing Paint Shaker.

Works with short GW (old hex/black top and newer) and tall Vallejo, Army Painter bottles.; just slide the insert for the taller bottles (see image). Depending on paint amount you can put two short GW paint bottles on th