Aaron 2 solid steel rollers flatland gap adjustable for gap. Crank handle on each and pore shot in gap while tuning. As you and a helper turn shot will fall through untouched while others are deformed. Trial and error until about half or less are deformed. A third hand to pore shot is handy.
I have found the X spreader to work well in 10 and 12. Use the flattened in 20. My sons were just starting out when we started using these and it doubled their hits. Now they consider it cheating although their bottom barrel contains a cyl. choke.
Younger one made it as a project in a welding class in trade school.
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