I have a EL-Nikkor 80mm 5.6 mounted in a deeply recessed lens panel for my "new" IFF Ampliator enlarger. The lens panel is very narrow and it's impossible to get the fingers in there to change the aperture. The Nikkor is, I suppose, one of the few 80mm small enough to fit in there at all.

I was thinking about making an aperture changing tool, perhaps some kind of tube that will fit the aperture ring.

Any suggestions?