Stanadyne Inc. stock soared in national over-the-counter...

Stanadyne Inc. stock soared in national over-the-counter trading as Emhart Corp. began an unsolicited $580-million tender offer to acquire the manufacturing company. Stanadyne rocketed $17.25 to $39.50 per share. Stanadyne said it would schedule a special board meeting to consider the $40-a-share tender offer begun by Emhart, which last week was rebuffed in a friendly merger attempt. Emhart, a multinational consumer and industrial products company based in Farmington, Conn., offered $40 for each of Stanadyne’s 14.5 million outstanding shares.