The Signo RT Gel is a pen from uni-ball which uses similar ink to their 207 line of Signo pens which they market as being resistant to check washing, being fade- and water-resistant, and acid free. The RT Gel formula isn't marketed as being resistant to check washing, though, and the RT .38 cartridges carry significantly less ink than their 207 .5 and .7 brothers. Furthermore, the .38 doesn't even have refill cartridges, so one has to buy entirely new pens every time!
But! It's possible to swap the ink cartridge from the .7/.5 onto the .38 nib.
Messy fun!
The whole process of swapping cartridges is dashingly simple. You need a pair of pliers, some newspaper to catch spills, and a mouth with lungs attached.
Step 1: Dismantle the pens. They unscrew from the silver nib on the 207's, or the entire rubber grip on the RT Gels.
Step 2: Remove the nibs with the pliers. They come off easily; just use a slight twisting motion and don't squeeze too hard.
Step 3: Replace the nibs on the new cartridge. You'll want to blow (very lightly!) from the empty end of the barrel so that the ink 'pools' out at the other end. This way, you don't introduce many bubbles in the ink. Just press the nib into the new barrel, and press it tight.
Step 4: Clean up the mess. Ink will spill out over the edge of the nib between it and the barrel. Wipe it clean.
Step 5: Reassemble your pens! Either cartridge will fit either pen, so if you like the larger sized style of the 207 pens, or if you have one of their Premier or LTD pens, you can put the .38 sized cartridge into the nicer pen.
Signo, uni-ball, RT Gel, 207, and whatever else are all copyright, trademarked, or what have you by their respective owners. But the pens are yours once you buy them, so have at it!
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