I had a look at the 16" rear wheel. Its cog is the 2 pin remover type. I broke mine years ago. Just use a hammer and chisel on a faceplate hole. I tried it. But had my big chisel and it wouldnt go in hole enough. So I thought that the cogs rear rusty. So put chisel to its tooth and hit it. The freewheel spun off the hub. Guess that cogs for the scrap yard too.