I've owned my Catalina 36 MKI for a year now. Previous owner had just had the rig inspected. in 10+ knots of wind at anchor or at dock I get mast pumping and I can't imagine that's normal. Is it though?
I wrapped two spare halyards around the lower mast below the spreaders which aleviated pretty much all of the issue. But is there something more permanent? Is the rig just not tuned correctly?