Pineider Pen Filler Inkwells Reviews

So far the Pineider Pen Filler has worked okay on the few cartridge and piston filler pens I've tried, up to a Pelikan M1000.
It will not work with the Visconti pens with the Hook Safe Lock system since you can't shove them in deep enough. Just make sure that your pen conforms to the two gaging holes in the box, passing through the large hole but not the small one. Then I test it first with plain water to be on the safe side. It seems to be a viable and economical solution.

I tested this filler on five different pens: a Noodler's Ahab, a Noodler's Konrad, a Nemosine Singularity, a Pilot Kaküno, and a Pilot Metropolitan. The Metropolitan was less than satisfactory, in that the section had to go deep into the top to seal and I managed to spill ink getting it back out. It did fill, though, so from that standpoint it was successful.

In use, once the vial has been filled one removes the plug from the top and inserts the pen's nib, turning the lower collar to cause the blue rubber sleeve inside to expand and seal the section in place. Then one inverts the assembly and activates the filler. The air in the ink reservoir bubbles out when the filler is reactivated, and the reservoir is completely filled. The problem I had with the Metropolitan was the section had to go deep into the blue sleeve to seal, leaving the converter the only thing sticking out. Pulling on it did not remove the section, which led to me disassembling the top and pushing the section back out.

This is a slick idea, and it works very well. But Pineider? Can we have a slightly thicker rubber sleeve as an available option?