A gunman snatched $300 from a cheesemonger, then cuffed him and his son to a forklift and sped off with his car, leaving the pair stranded in a Williamsburg factory yesterday, sources said.

Owner Zindel Binik, 51, who was at Cheese Smokers Inc. with his 17-year-old son, used a radio to call cops. Police found his car under the Brooklyn-Queens Expressway. It held $32,000 in medical equipment that Binik kept as a Hatzolah ambulance volunteer.