The last-minute plea is being sent on Tuesday by former branch president Gary Kent, as around 400 party members prepare for a crucial meeting.

They will meet at the Rex hotel on Wednesday evening as the party's divisional council with the task of deciding whether to reopen the controversial preselection process for the federal election.

When the preselection was held last month, Zed Seselja beat incumbent Gary Humphries to be chosen as the Liberals' Senate candidate for the September 14 election.

After first accepting the decision, Senator Humphries later decided to dispute the result, saying many of his supporters had been denied voting rights.

As a consequence, the divisional council meeting has been arranged to review the preselection process.

Mr Kent called on Liberal rank and file to decide on Wednesday whether "this is the way" they want to choose election candidates in the future.

"If you uphold these pre-selections you will institutionalise a standard of behaviour that will eventually lead to the demise of the division," he says.

"You have seen what has happened in NSW with the Labor Right – You have the power tomorrow to ensure that candidates win because of their ability to convince the broad party membership of their merits and for no other reason."

Mr Kent delivered a withering criticism of how the preselection was conducted, saying many members of the Women's Council and Young Liberals could not attend meetings to gain voting rights.

Former Liberal senator Margaret Reid missed out qualifying at an earlier meeting but has since been confirmed to vote on Wednesday night.