I'm a bit confused
one says that is loose the other tight
probably 3d printing in Metal can vary a lot from batch to batch.
Anyway let's see if I can help you somehow.
The transparent one fits great, but the metal one's stem refuses to go on! Do you have any suggestions on making it fit? I'm not very good with tools.
It's extremely easy to fix!
Take a small flat screw driver and use it as a lever to SLIGHTLY spread the stem. Proceed with caution, but don't be afraid: it's steel, pretty durable.
Ahhh, Matt3o, I got the matte black metal one. It looks great, and I love it. But unfortunately, as you said before, it is a little loose.
If it is loose all you have to do is to place a little piece of plastic bag in the stem. Unfortunately steel is very hard and doesn't bend easily, so it's difficult to find the perfect match for the MX stem.
Please let me know if it works.
To both: if you can't make it work, just let me know, I'll send you money back!