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On a lark, I picked up an interesting PILOT pen. It's some kind of micro rollerball, probably equivalent to 0.3mm or 0.5mm. PILOT made these as a series of technical pens, as an alternative to using an <XF> nib fountain pen or a stylograph. PILOT discontinued the Hi-Tecpoint line, but they did "refresh" it with their "Precise" line with V5 and V7 pen refills (0.5mm and 0.7mm respectively). Anyway, while PILOT had made disposable pens that use these refill tips (incorporated into plastic bodies), there were also high quality stainless steel examples. I even saw a sterling silver one as well. What makes these rather exceptional is the tip of the pen. It has it's own "trap door" mechanism. I was able to observe this by rotating the mechanism and observing the opening end closing/opening. VERY cool! It would go a long way to help protect a refill from drying out. Also, when you install the refill, it is secured in place with a finely machined metal screw cap that "seals" it in. That must also provide some resistance to drying out. The only caveat is... PILOT says that they no longer make the refills for this! Thankfully the example I bought came with a refill, tucked underneath the red velvet lined plastic tray in the case, still sealed. It is marked LH-25EF. The model number of this pen is LHT-300S. I contacted PILOT corporation and they do not have an equivalent replacement. I'm very dismayed by this... given how terrific the quality. Now I've come to discover that sometimes there are refills that are discontinued, but because often there are plastic bits involved in the refill cartridge, it is sometimes possible to modify it to fit. I have done this a number of times with other pens. However, I don't have anything that resembles the refill requirement for this pen. And naturally, I'd prefer to use a needlepoint refill... installing a standard ballpoint would be a bit pointless (no pun intended). I'll take some photos of the refill packaging and refill itself with measurements, in case it helps. Does anyone here have any experience with PILOT Hi-Tecpoint pens and know of a possible refill replacement from another brand that might work, even if it requires some modifications?