[Kidkraz]

You shouldn't need a large hole. Drilling a hole at both ends of a crack, is referred to as "stop drilling". I'll assume a size of the lead in yer standard #2 pencil would work. The intent is the holes, prevent the crack from growing longer. It's been awhile since I've read those other posts on repairs. I believe folks took shavings of black pvc and mixed it with the glue to make a patch.
Hope this helps some. Good luck.