Columbia has a section on rig tension for the c-28 on their website that might give you some insight. You might be able to find some info for the 34 there too I guess.
here is the listing of boats they have info for
08-13-2007 10:38 AM
Columbia 34 Rig Tension
I need to know how much the rig tension should be on our boat, or even a close guess for a boat this size and type. Its a 1970 Columbia 34, and I will be using a Looss Guage to set the tension. Thanks.