These pens are a pain to refurbish, as the original manufacturer glued the sections in place. On this pen I inadvertently cracked off the threaded end of the body while attempting to work it free (with a heat gun - sometimes it works, sometimes not), but the break was clean so I was able to use the rest of the body and slip-fit the cap. The original 1920's era rubber sac was of course long since perished, and I replaced it with a #14 sac normally used on Sheaffer Snorkels. The body is nitrocellulose based celluloid; I verified that by burning a sliver of the broken threads - it lit up like a flare! (I showed my daughter - she said, "You're such a boy!" As Trog says below, more delinquent attraction...)
One interesting aspect of this pen is the crescent filler (inset). I've never used a crescent filler before, but it works as advertised. The crescent says "Made In Japan", from the pre-WW2 days when that meant cheap, shoddy merchandise, as opposed to nowadays when it means the best!
Glass nibs are usable writing implements, I was pleasantly surprised. This pen needs a little priming prior to use if it's been sitting unused awhile - a drop of water on the nib gets it going just fine. I can bear down on multipart forms like checkbooks, or use a light touch as with a regular FP nib. The usable writing angle range is huge - all the way from 90 degree vertical, like I use for a ballpoint, to as low and close to the paper as I can bring the pen, so the standard 30-60 degree writing angle is easily managed. My nib was a little scratchy when I first tried it - a few swipes on 2500 grit sandpaper yielded a nice, smooth nib tip.
The pen seems to prefer a dry-writing ink - there is no formal flow control mechanism in the feed, as the nib IS the feed. (I've seen pictures of later Spors pens that had semi-hooded nibs - interesting ...) My first fill was with Skrip Blue, but I thought it flowed too wet, so switched inks.
As there are no metal parts in contact with the ink, I have the pen filled with an iron gall ink (Lamy Blue Black) and don't have to worry about the somewhat acidic ink ruining my nice glass nib - I'd bet that Bay State Blue and other non-standard formulations would also work without problem in this pen.
PhilM has a nice blog about his Spors pen refub.
Edited by Robert Hughes, 24 February 2009 - 13:45.