cant get flow

K.Black

I just completed a job where I had to run 3/4 onix tubing to a convector and a piece of runtal. I am on a thrush ballancing tee job 1 1/4 main through the basement (very old tee's) thrush tee's on the supply and regular tee's on the return spaced about 12 inches apart (common main). There is heat all through the house except those 2 units the tube is not kinked anywhere and I have water at the units. Am I supposed to change the thrush tee's to regular tee's and put a circuit setter in the return side.I have never worked with these tee's before and Iam not sure what to do. Can anybody help me with a solution to this problem?