Yashica ML 28-85mm Teardown
Lens ring removal shows the 2 spanner holes in the threaded holder for the front element group's assembly block. No screw loosening or removals are necessary to gain access to any of the affected glass surfaces that need cleaning. This lens had no patches of lacquer or thread-locking compounds to deal with. Truly the easiest lens teardown I've ever had in getting to the internal elements on the front block!