What did the Judge recon a body would need to reform Pap?

In Chapter Five, Pap goes to Judge Thatcher and tries to make the Judge give him Huck's money. The Judge refuses, and he and the widow take a case to court in an effort to get Huck legally placed with one of them. The custody judge is unfortunately new to the town and refuses to separate Huck from his father. Judge Thatcher, realizing he cannot win, gives Huck some money, which Huck immediately turns over to Pap. Pap gets extremely drunk and is placed in jail for a week.

The new judge then sympathetically takes Pap into his home, dresses him well, and tries to reform him. After thinking that he has reformed Pap, the Judge goes to bed. That night, Pap sneaks out of the new judge's house and buys some alcohol. By morning he is so drunk that he breaks his arm in two places and nearly freezes to death on the porch. The new judge is livid at this betrayal of his trust and comments that the only way to reform Pap is with a shotgun.