Wish I were handier, or I'd be announcing this instead of just suggesting this accessory for a pen-type PV.
How about an slip-on actual (albeit short-barreled) ball-point pen attachment? That way, the self conscious among us could truthfully say their 510 was their pen. Moreover, if it had some sort of sleeve long enough to fit loosely over the cartridge-to-atty, it would provide a safeguard against leakage. I wouldn't get so fancy as to suggest it be a retractable pen; just one with a cap over it.
How about an slip-on actual (albeit short-barreled) ball-point pen attachment? That way, the self conscious among us could truthfully say their 510 was their pen. Moreover, if it had some sort of sleeve long enough to fit loosely over the cartridge-to-atty, it would provide a safeguard against leakage. I wouldn't get so fancy as to suggest it be a retractable pen; just one with a cap over it.