After looking at the pictures of your Wilson Bernhard Langer clubs, I would think a tin of WD40 and a piece of wire wool from the kitchen and a little hard work would bring the heads up fine. of course if they are loose on the shaft you are wasting your time. But, if that works, then re gripe...
I still use a set of Wilson Bernhard Langer golf clubs, the set includes 3 iron through to sand iron and a 5 wood and a 3 wood I purchased them in England in the 1980's for around 220 pounds sterling. I use a balanced face putter purched at the same time made by Wilson and a large headed...