New Visions Entertainment, Los Angeles, said it...

New Visions Entertainment, Los Angeles, said it has retained investment banker Crowell, Weedon & Co. to help it raise additional capital and to possibly modify terms of its convertible subordinated debentures . . . Argonaut Group, Los Angeles, said it completed the repurchase of 2 million shares of its common stock under a program begun in December, 1987 . . . Allegheny International Inc. said it has filed a plan of reorganization for its Sunbeam Corp. subsidiary in an attempt to bring the profitable small appliance maker out of bankruptcy court protection.