3M™ Random Orbital Collett Assembly, 66119, 1/4 in -20 Pneumatic Rotary Buffer. Genuine 3M™ Finesse-it™ Pneumatic Rotary Buffer Replacement Parts keep your 3M™ Finesse-it™ Pneumatic Rotary Buffer in top working condition. Every part is available to order, and finding the part you need is easy using the schematic and parts list found in the tool instruction manual.