I did mine back in March and don't recall any major hangups. Are you certain you don't have the nail puller on you still?
I would first try going back to the nail puller spot and interacting with the CS ??? because every once in a blue moon on Nasomi, you'll find you have to double tap on a ??? for a mission or cutscene. Nasomiland Rule #2: Double Tap.
If you attempt that and nothing happens or changes when returning to Sandy, then send
Nasomi a PM on IRC with all of the details about where you're stuck in the quest. Leave the chat window open for him to respond to you. If you don't hear back in a day, send him another message.