I picked up an Asvine J16 in solid titanium for $55. It has a Jowo EF nib. It is a piston filler. Compare this to the TWSBI from Taiwan for $40.
At one time the J16 was available in Ebonite, which looks very nice, but right now (early August, 2026) there are none on Amazon. The word is that there will be more available in a few months.
My J16 is an extremely wet writer, and I'm looking to tame it down a bit. I cleaned it out, and yanked the nib and feed. I have a 0.05mm (0.002 inch) brass shim. It is tight when passed through the nib slit, so it would not seem that the nib itself needs to be squeezed tighter.Using some other nicely working pens I have as a guide, I set the nib on the feed and push it back into the pen.
The body is acrylic (not molded plastic). They take acrylic rods and machine the pen parts.
It "blows more expensive pens out of the water". You can get a 1.1 stub. The ink capacity is large (3.0 ml)
I couldn't resist and bought an EF demonstrator and (something new) a stub in brown swirl.
Tom's Pen Info / tom@mmto.org