Spin it with a Spanner.
Jamming a tiny screw driver into bottom-bracket cup holes, and then using another, larger screwdriver for a lever is not going to adjust anything correctly, and you're going to ruin a perfectly good screwdriver. Make life easier on you and your tools, by picking up the Park Tool Adjustable Pin SPA-6 Spanner. The replaceable 2.2mm pins and adjustable width will fit most bottom brackets and you'll set get bearing preload right the first time.
- Item #PAR0067