how do you create pads with an oval slot hole?

This is a heavy duty oblong hole punch known in the saddlery trade as a crew punch It is used to make a long slot shaped hole to fit a buckle onto a

Commercial Table-Top Punch with adjustable centering guides Slot size: 14 x 3 mm

slot man Description: Gilder Grid Single Slot Oval Hole, A: 2000x500, Pack: 50 Vial, Price: $, Add to Quote: Add Cat #: G2010-Cu, Description: Gilder Grid Single

curved linear slot diffuser Watch strap punch tool set 4x2mm Oblong Slot + 2mm Circle Slot Punch for leather Belt, Watch Band, Watch Strap, Handbag, Purse making AD Watch band Hole Punch