I have a new (old) Rickenbacker 4001, and need some string advice, or guidance on where to find it. Common wisdom is that older Ric basses were designed for low-tension flatwounds, and that higher tension strings can cause neck problems. The problem is, I can't find any reference to what would qualify as low tension or high tension! As an example, the D'Addario catalog lists four string, long scale sets as running between 133 pounds (XL Extra Super Soft .035/.095) and 264 pounds (1/2 Rounds Heavy .055/.110) tension. How should I classify tension? And where should I stay with a Ric 4001?