Massage Gun Paint Mixer 2oz or 59ml Bottles Plaid DecoArt Folkart

I purchased a massage gun from Facebook Marketplace and created this adapter to mix my craft paints. The shank opening of the massage gun is approximately 13mm in diameter. I used an O-ring from a pack I had that has a 12.42mm ID and a 2.62mm cross-section. I printed it in PETG with three walls, ensuring the open end faces the bed. You can slide the paint into the open end and secure it with rubber bands.