Front Element Removal
Here is where we remove the front lens element from the barrel. There may be a small #00 set screw on the front of the retaining ring that you will need to remove. My lens, it was missing and the previous "repair" person filled in the hole with lovely black silicone...There are more surprises as I went deeper into the lens. For the retaining ring removal, if the ring has not been modified like mine has (added a second hole 180 degrees opposite the set screw hole), use a silicon lens element removal disc. These are widely available on Amazon and come in a multiple size pack. ALWAYS wipe down the surface of the disc with some alcohol and a cloth before use. If there is any debris or metal chips on the surface of the disc it will destroy modern coatings and scratch the lens. I broke the ring free using a silicon disc and finished the removal with a lens spanner wrench.