Thread: Fixing legs to vanity

I am making a vanity, using Victorian ash for the frame and top. I intend to use hardwood doweling rod(?) 32 mm diameter for legs, with holes halfway through bottom boards cut with holesaw; and tightened with sturdy screws with hex heads using the holes left by the hole saw pilot bit (and of course pre drilled holes down into the 'legs'.

However, the holes made by the holesaw will be a little bit (0.5 mm) wider than the rod.
1) is there an easy way to get a good fit (maybe using a strip of thin cardboard?)
2) is there a better way of fixing a round leg to the underside of the cabinet? or
3) is there a better way to keep the vanity above the floor?