Cleaning and repairing vintage lenses are much easier than fixing new lenses. This video will walk you through how to take apart and clean out a Pentax 135mm lens.
This repair Pentax lens repair video is for a 135mm but the tear-down is similer for many of the Pentax lenses like their 50mm, 35mm and many of the K and M series glass.
A few of the tools needed for the tear-down of the Pentax 135mm. is – jewelers screwdriver set, cotton swabs, Isopropyl alcohol or nail polish remover as cleaning fluid, micro fiber cloths for wiping down the lens elements, camera lens spanner tool, and a hard, well lit working area.