The difficulting IMO with this sort of trade is being able to predict the bottom of the calls.
I have a buy in at 0.40 way ahead of time, and one at 0.45 and 0.50 on hold and ready to go. I tried to buy at 0.45, but wasn't quick enough.
If I were quicker, I could have sold it all at 0.62 30 seconds later.