Wait, are you saying that there is light coming through the tripod area? If so, that's most likely the issue. Tape it over! It is possible to have a tripod screw that is long and goes through the inner cap of the tripod socket on Rolleis.
Rolleicords should not need felt or such. The design is light tight if all is straight and sealing properly. When you close the back, it should 'snap' closed before you pull the latch back tight.
Be very methodical in how you tape the outside, etc. Light leaks are a real pain to track down sometimes. That's why you need to put the developed film in the camera- it will show you where the leak is.
When you open the back, you can rotate the film using the wind knob until the end flap is exposed. Pull it up a bit, hold tight, and wind the film using the wind knob a bit tighter. Then remove it. When loading I will usually put light pressure on the film while I wind to keep it tight (a loose beginning is a common cause of loose spooling).