Hitler rejoined the party, as member #3680, on July 26th, 1921. However, some of his opponents in party leadership were not yet ready to accept defeat. They made the desperate effort to stop him by denying confirmation of his dictatorial powers (confirmed in a hastily drafted new party constitution).
They even printed 3,000 copies of an anonymous pamphlet presenting him in the most denigratory terms as the “agent of sinister forces intent on damaging the party”.
It did not help. 554 out of 555 party members present at the extraordinary members’ meeting in the Festsaal of the Hofbräuhaus on July 29th voted for accepting new dictatorial powers over the party granted to Hitler. Essentially transforming NSDAP into a new-style party. The ‘Führer party’
It was a high-risk, high-return decision. Initially, it paid off because the Nazi party did get the absolute power in Germany and did implement most of its program. However, ultimately its Führer started to make horrendous strategic mistakes which in a few short years led to the demise of NSDAP and to his suicide in the Führerbunker.