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Hello FPN, I was wondering if someone with more vintage flex knowledge than I (which isn't much) could advise me with my newest acquisition. It is a Mabie Todd Swan SF250 circa 1937. I need to do some more research on the hallmarks stamped onto the gold bands. Upon first using the pen I noticed some quirks here and there, like dry starts at the beginning and some railroading. It also seemed to work better when holding it at a rather high angle, though then it feels a tad scratchier. After using it for a while, these problems pretty much go away entirely, as if it gets much wetter after some use. I was looking at the nib through a loupe and I noticed that the gap of the tip is a little wonky. It's a bit V shaped when looking at it head on where the tines meet. The tip of the left tine somehow seems bigger than the right, like there's more material. The gap of the tines is pretty much parallel from the hole of the nib to the tip of the tine (I thought it was supposed to be a bit more tapered towards the tip where the tines meet.) The pen seems to be in great condition otherwise, the lever works well, the gold bands aren't worn, the inscriptions are still legible, etc. But I'm wondering if this nib could be improved if I sent it to someone competent. Like I said, it seems to behave much better after it's been used for a minute or two and then it lays down a good amount of ink (quite a bit, though I am using Iroshizuku with it, which maybe is too watery?) and I can make a flex stroke from top to bottom of page without it railroading. I'm just wondering if with some adjustment I could get a bit finer line on the upstrokes and just a more consistent performance over all. On the side strokes it's about an XF/F if done fast, the diagonals or upstrokes seem more like a F/M and the downward strokes can get to 3mm (though I'm a bit paranoid of doing that very often.) Anyways, if anyone wants to throw in their two cents I'd appreciate it. Could that V issue I mentioned be something that happens with a nib that flexes that much? Does the angle become more parallel when it's flexed? That's just a random thought though. Thanks!