I have a really nice .5. Vacumatic Major Azure Blue that's in need of a replacement feed. The pen is gorgeous, great clarity despite ambering, I've installed a new diaphragm properly that's cut to proper length, the works, going to put it up for sale once complete. The fins on the feed had micro-fractures I didn't see until I went to test-write and the find fell off like a loose filling on the paper I was writing on.
Vac' Major Feed is all I need, but if you have a complete .5. section/nib/feed assembly in excellent condition I'd consider that too, if the price is right
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"None of us can have as many virtues as the fountain-pen, or half its cussedness; but we can try." ~Mark Twain~