After taking a look at my rayon balls I discovered they were packed hard into the insert so much that they could barely absorb any fuel, also the wick was bunched up.
Large Size Rayon Balls for Narrow Drosophila Vials, Non-Sterile, 2000/bag. Life Science Products
Sterile Rayon Balls and Sterile Cotton Balls
Absorbent Medical Degreasing Cotton Balls for Infants Baby Dipped in Alcohol Iodophor Rayon Ball Wound Disinfection Cleaning