uummmm? Kind of a dollars to save dimes solution? Rather than using two $6.99 holders and time to cut or grind them and a welder... any piece of 1/4 material (lexan, plywood, ABS plastic pieces of mouse pad, dense cardboard) could have been trimmed and placed flat, under the stamped sheet metal piece. This would have retained the designed shell holding lip and allowed the press to function completely normally and hold the shells in the crimp station.
Past that - if the only goal was to use the wads... why spend time trimming the shells? Cheerio, navy bean, Kix, etc.
Good for you for setting a goal and making it happen, though.