Other than return them, because it isn't worth the cost of return shipping.

Levengers has a sale on their Magnum cartridges (12 for 2.95 with
free shipping) and I bought three boxes, not knowing they won't
FIT in my pens.

(new to Levengers inks - and I have new to me Jinhao pens that I wanted some
new and different ink for)

I have converters for all of the pens so can I successfully empty the
cartridges into ink bottles and use it that way? When I have an empty ink bottle, that is.

Never used a converter before either.

Or maybe just get a sample pack of ink from Pear Tree and
a write fill kit and empty the cartridges into the small bottles
when they are empty and then fill the pens?

At least it wasn't a costly mistake.

But I like the ink and want to use it!

Write fill kit or, depending on the laws where you live, insulin syringes work well for extracting every iota of ink from a cartridge and transferring it.

I buy syringes now and then from a vet supply catalog - 1cc syringes with long needles are easier for getting everthing out of the cart without making a mess or losing ink. Unless you're scared of needles.

You could transfer all the ink from for each color in this way to a single container then fill your pens from that container as needed. I use transfer pipets for filling carts/pens - cheaper than syringes and safer if you worry about contaminating ink by reusing a syringe.

Thanks, KCat.

Buy a new pen they will fit in of course

If you are going to use syringe and needles, don't forget you need blunt needles. If you can, buy dispensing needles, large bore with a blunt end. If you can only get normal needles, get the largest needles they have in stock. Insulin needles are too thin to be useful. Then remove the point by rubbing it against something like a brick. Hold the needle at right-angles to the brick and swipe it until you have a flat end.
Don't try to cut it off with pliers or cutters, you will simply squeeze the cut end closed before it's cut off.

Actually, that's what I do. The trick is not to cut them in the middle of the needle, but rather cut them very close to the tip.... that way you're only cutting off the very sharp bit, but leaving the needle hole intact.

Don't think I hadn't considered that.

Seriously, these cartridges will fit in a Waterman Kultur or a Pelikano. I'm thinking they'd probably fit a Pelikano Jr. as well.

I would just empty the cartridges into an empty bottle and use the ink from that.

Really?

Is the Waterman Kultur the same size as a Phileas?

Or would that be asking too much? (since I have one and another is on the way)

It's the same size, but I haven't tried the cart in a Phileas. The Phileas does have a brass sleeve inside that the Kultur lacks. With that said, the Waterman cartridge is fatter than the Levenger cartridges of this type I bought, so I imagine it would probably work. Note that the Waterman pens technically take waterman size carts and not international ones. In reality, I can't tell much difference other than the Waterman cartridge body (but not the end where it's pierced) being wider than international.

Bless your heart; I think that might work.

At least the Levenger cartridge fits in the Phileas and I can screw the nib on; that's
a start.

Hmmm ... wonder if the husband would notice just one more Phileas floating around.

Thanks everyone, so much.