If you have an Ion Drum Rocker that has seen serious use, the nuts in your plastic wingnuts that tighten the clamps for pads and cymbals are probably worn. On my 2008 PS3 Ion Drum Rocker some of the nuts were worn to the point that they wouldn't tighten all the way. The correct size for replacement is:
6mm x 1.00, or M6 x 1.00.
If you live near a Lowes, this is the item: https://www.lowes.com/pd/The-Hillman-Group-5-Count-6mm-Zinc-Plated-Metric-Hex-Nuts/3012716.
Now go forth and rock.
