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Ever in need of ready cash, Beaver (Jerry Mathers) and Gilbert (Stephen Talbot) form a lawn-mowing business. Trouble is, no one in the neighborhood needs their services. Acting upon a suggestion from Eddie Haskell (Ken Osmond), the boys decide to work on "spec," mowing lawns first and then asking for money afterward. Not surprisingly, the scheme backfires -- and to add insult to injury, Gilbert gives up on the project, leaving Beaver to soldier on alone.