Fig. 2.

To pack a rotor using this device, the sample must first be pelleted in a 200 µL ultracentrifuge tube (a). Pieces C and D create a chamber where the rotor is secured (b) and piece B is screwed on. The inverted ultracentrifuge tube is placed directly into piece B (c) before it is capped and placed directly into a 15 mL conical centrifuge tube (d). The entire apparatus is then spun in a swinging bucket centrifuge at approximately 3,000 × g.