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For opening up the back of the barrel on the Leonardo Officina fountain pen so you can get at the filling unit
26 inch top diameter found on Standard and Deb size Vacs but they use 4-40 (which are smaller than 10-32) or 3-56 (smallest) threads
Refill works
Large: Outer diameter is 0
NYLON JAW PLIERS (Tool PTS5) i buy old pens For opening up the backThese pliers have 2 square cross section nylon jaws to prevent leaving scratches and other marks on your work piece. Use these where you don't want to harm the surface of the piece you are working on. Great for straightening clips that you can get off the pen or working on flat pieces that need to be straightened and have a thin, easy to damage surface. Custom made by Pentooling.
