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Sorry, I know the Repair Q&A is mostly meant for fountain pens. I know this is a long shot, but I have a very unusual spring that I found in my "bag o' springs" that I keep around, containing springs harvested from junk pens that are getting thrown away. I have occasionally come across a ballpoint with a missing spring, the wrong spring installed, so the springs baggie is very helpful to me. Among them, I found a lone "5 banded" spring in a cellophane sleeve. It's a beautiful looking spring made of nice quality springy steel alloy. I'm pretty sure it's over 20 years old, and I haven't a clue as to where it came from. I don't know if it came as a spare for a pen I had once, or... a plausible chance... that it isn't from a pen at all. It might be for something else entirely. The oddity here is those 5 bands of compressed spring. I've never seen one installed in a pen before... so maybe it's some other purpose entirely. However, the inner diameter makes it very compatible with a lot of pen refills. Length is 32 mm, and diameter is about 3 mm. If you've seen one of these before and you know what it's used for... I'd be so grateful to hear about it. Thanks very much!

The specific pen refill I'm using is the P900 Schmidt, which is measured at 3 7/8". I'm going to need to buy at least 100 of these springs at once. Any advice or direction as to where to buy such springs would be splendid!