The cap end of Faber fine Uni-Ball pens were obviously designed as an HO or S manhole cover. A new X-Acto knife will easily cut off the cover (cut flush with the lip on the side, it’s almost like they provided a cutting guide!). The photo by Richard Schumacher shows the pen, a cut off manhole cover end, a Preiser HO figure, and a Walthers Cornerstone street system HO manhole cover for comparison.