Start by scrambling up to a crack to the right of Thunderbolt. Climb this crack up to the bolted anchor on Thunderbolt. Clip a bolt at the anchor and traverse to your right (10 feet) to a sloping ledge to a gear belay. Alternatively, start up the crack, then squeeze through a chimney and go directly to the same belay ledge.
The first pitch is a little grungy. Therefore a better option is to climb the first pitch of Thunderbolt and traverse right.
For the second pitch step across to an island like rock. Then leave the island stepping into a crack. Follow the crack up and walk over to a thin chimney. Suck in your gut and take this to the top.
Belay at the top of the chimney. To descend, step over the chimney and walk over to the Middle Parallel Space anchor (two raps to the ground).