I purchased a Wide Jaw Drill Centering Vise from Woodturningz for use with my drill press for drilling pen blanks. Each time a put in a blank to drill, whether it be walnut, pine, cherry, etc. the blank will slip down as I am pulling down the drill. I've tried to not put much pressure as I drill down, but the blank still slips down into the vise. I have the vise clamped to the table and it doesn't move. I've tightened the vise as much as I can and it still happens. Any ideas?
This is the vise.