My husband and I wanted a tandem but didn't want to pay much, one came along, a circa 1964 CCM Mark IV. It's been stripped and soaking in oxalic. Going to rattle can it and add some proper wheels and brakes and cold set the rear and add a few gears. The guy had the poor thing in pieces, it was rideable with a few adjustments. Coaster brakes + tandem = hell no.