To climb "Twinkie", go up the middle of the prominent large block in this photo. The 6-inch horizontal crack is about 10 feet up.
It's hard to distinguish, but attached to the large central block is a smaller rectangular block, protruding from the left side. It sticks out about a foot. It's so far left that I think it must be off route, but I used it to get up the block and get to the top.