Attached is a picture of several feeds of fountain pens I have completed. On the left are four identical feeds from two Optimus Desires, a Raven and an Eagle. On the left are two from a Jr. Gent II and a Magnetic Vertex. Notice the extended nipples on the two on the right. The threading on the two styles is also different, making them non-interchangable.
I am somewhat mystified by this because I include a converter with every FP I sell, and I have sold several Optimus, Raven, and Eagle FPs in the past, with this never having been an issue. It's an issue because I lost a sale this past Saturday at the Knoxville market because the customer wanted a converter to go with the Optimus he wanted to buy, but I couldn't get one to fit.
I am going to direct Constant to this thread so he can look into it. In the meantime does anyone out there know if there are feeds available that will accept a converter and are compatible with Optimus, Raven and Eagle. Alternatively, are there different brand converters out there that are compatible with Optimus, etc. Many thanks to all for your inputs.
John