I use this video:
http://www.youtube.com/watch?v=Q1mRhcquZTM
There is a group dedicated to Tin Lizzie on Yahoo.
I've been pretty lucky, I haven't had any tension issues with mine, however, couple times I missed with the thread path around the tension disks. Make sure the thread is going thru the disks and not between the disks and the machine body. I would also clean the tension disks one more time. Normally if you have loops on the back, there's something going on with your top tension.