It Worked For A While
Old Raliegh M60 pulled from the dumpster with vertical dropouts. I welded pipe caps to a singulator that was junk and put a spring inside to keep tension. Bike was junk and still is, but it got me started. For the most part I ran front brake due to not willing to invest in a new rear tire. For a rear brake the "shoe on the tire" technique worked well. Attached is a photo of a rear shoe gone bad.