I found what I think is an old video camera lens. I placed it down into the front of the 60 MM Nikon micro lens, the way the 60 is made, makes it a nice tight fit. The rim of the lens is very narrow so the add on lens will sometimes droop a bit. The tape is a easy releasable painters tape. Works well and leaves no residue. Not sure of the magnification, but seems to be 3X with out the extension tube, and 6x with it.