Anyone know where I can buy a replacement nib for my Wality 69L? Also, any suggestions for manufacturer of the nib?

I don't know if any of these will fit. If they do, it would be a nice upgrade to the Wality.

http://www.nibs.com/KitPenNibs.htm

Those nibs are made to fit the custom pen kits that some of us make...
There are very few other pens that they will fit...
There is no generic fit nib on the market that I know of.

Assuming the length and breather hole spacing is OK, is it possible, and practical, to adjust the curvature of the back end of the nib so it corresponds to the feed of the pen? It seems like this could be fairly simple, or a huge amount of effort that will end up with a ruined nib and/or feed.

I don't own any Walitys, so I can't speak from experience, and it looks like there's some variation in Wality nibs (some open, some semi-hooded, for example), but apparently in at least some cases Esterbrook points will fit them. Pick up this this recent Esterbrook Forum topic from [post="463632"]this[/post] point on, and also check item #6 here.

-- Brian

You might try contacting the manufacturer:

http://www.airmailpenco.com/airmail/contact.htm

Steve