Conklin Steel Extra Fine Nib Unit

I purchased the Conklin Steel Extra Fine Nib Unit to replace a flex-nib in my Conklin. The new nib unit did its job perfectly. It screwed in the pen easily and did not leak. The nib flows nicely and the nib is quality Conklin. I now have a two-in-one pen. Both a extra fine and flex nib. I recommend this nib unit without hesitation.