Jag Man wrote:
The bathroom vanity I got needs a shelve in the under-counter space.
One side
can easily be supported with the little peg-style supports because the
holes
would be through a verticle side inside the vanity. Unfortunately, the
other side
is at the exposed end of the vanity, so I would not want to drill
through.
So the question is how to support that side of the shelf. The end wall
is
1/2" particle board.

clipped

Cut a piece of plywood or whatever to fit inside the end panel, drill
holes in it. The shelves will hold it in place and it will hold up the
shelves.