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XL Stiff Focusing Fix
Stiff focusing fix?
by Bob Hutchinson
Some XLs have really stiff and hard to turn focusing cone situations that seem to defy all efforts to loosen thing up. Well - - - - I have found one thing that can cause serious stiff focusing on the XL. Here's how to fix it right away.
The actual focusing cone, the part with the knurl for gripping, is a tight fit to the bearing that bears the rotating load. It is such a tight fit that the three screws that lock the cone to the bearing are probably not necessary. These screws, on the outside of the cone have points that fit into dimples on the O.D. of the bearing as good design practice.