Depending on its size and density you might use a tubing cutter to score the perimeter, then use a padded vise to hold and it cut it off with a fine toothed quality hacksaw blade. *NM*
Depending on its size and density you might use a tubing cutter to score the perimeter, then use a padded vise to hold and it cut it off with a fine toothed quality hacksaw blade. *NM*