For the small blind hole here is what I did. It was really easy.

I took a thin square piece of pressure treated wood (the biggest that would fit through the hole). I punched a small hole in the middle of the wood and put some thread through it. I slipped the wood in the hole and pulled it flush. I glued the block in place with super glue. I removed the thread. Then I filled the hole with “Marine Tex.” Once dry, I sanded it flush.

Matt