The Uniball Signo RT Gel mini Hack

Step 3 Cut the Uniball Signo Cartridge

Using a utility knife , x-acto knife or other sharp instrument, trim the Uniball cartridge down to the same length as the G2 mini cartridge as shown in the photo above (see the dotted line). I've that the Uniball Signo cartridge uses a much thicker outer wall compared to the G2 mini, so the G2 may actually have close to the same volume of ink even though it looks like less.