Scottish Labour leadership hopeful Ken Macintosh has called for a radical shake-up of the rules covering the contest to elect Jim Murphy's successor.
The Eastwood MSP has said the party should hold "open primaries" allowing registered supporters, not just paid up members, to quiz candidates before the vote.
He also said membership dues should be cut during the contest to encourage more people to join.
Mr Macintosh, who is challenging deputy leader Kezia Dugdale for the top job, repeated his call for the party to move to one-member-one-vote (OMOV).
Under the present electoral college system, a third of the total vote goes to each of three sections: parliamentarians, party members and supporters in affiliated trade unions.
Moving to OMOV would mean their votes all carried the same weight.
The MSP set out his plans in a letter to leader Jim Murphy and the party's ruling Scottish Executive Committee.
He said: "This is a time of exceptional political engagement in Scotland and people have never been so active in the politics of our country.
"I want to enlist their help in re-shaping and rebuilding the Scottish Labour Party.
"I am not going to make bland assertions of seeking party unity if that means protecting or preserving the influence of vested interests, but reclaim this party for the people we seek to represent.
"I believe holding open primaries throughout Scotland will offer Scottish Labour a real opportunity to engage with a politically energised electorate, to listen to their concerns, their hopes and their aspirations and allow our movement to share our principles and our passion for Scotland free from the constraints of an election.
"Scottish Labour will rebuild and that process can begin with a robust, open and transparent leadership contest."
Mr Macintosh came second to Johann Lamont in Scottish Labour's 2011 leadership contest.
He took the biggest share of the vote among ordinary members but Ms Lamont won stronger backing from parliamentarians and union members.
He said he did not support calls to re-open selections for regional MSPs - an idea backed by Ms Dugdale - unless all candidates were chosen afresh.
Despite the radical overhaul of the rules he proposes, Mr Macintosh said the party should consider electing the new leader before the Scottish Parliament recess begins at the start of July.
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