Every time I have to fix a flat tire on my old 4-8.00s I always say there going to go.( happens a couple times a year) Getting the tube back on is always a pain. Mine have an old tube glued over the outside of the good tube to make it thicker which makes it twice a hard.Well this time I found a better way. Put the tube in the tire, inflate it, put a plastic bag over the wheel rim, wet it with water if needed and it will slip right in. let the air out and put the valve stem back in the hole and fill it with slime. I think I'll keep it another year 
