I have a client who complains of lower back pain and upon working on him for the first session, I found he has large, marble-size adhesions in both the left and right QL areas. I have come across these stubborn knots before, and found the piezoelectric technique (tapping a warm stone held over the adhesion with another stone) to be particularly effective for breaking them up. It doesn't seem to be working on this client though. The knots have been there a long time (he's a bus driver--30 years!) and are large and hard as rocks. Any advice on other effective techniques would be really appreciated. Thanks!!