I have been meaning to share this for some time but didn’t get around to it until now.
I really like the Dollar 717i Demonstrators. They are cheap piston filled pens that are quite reliable and hold a lot of ink. The cheap Inoxcrom pens that are commonly available have the perfect donor nibs for the Dollar as they are a perfect fit in the section and are long enough to be ground quite a bit and still have enough left over ahead of the feed.
The ink channel in the feed can be deepened/expanded a bit for better ink flow. I do it only if I have the nib drying out during use, most of the pens work fine without having to do this.
I use the same method for grinding left-oblique nibs I use for practicing Arabic Calligraphy.
I have laid out the steps in a handy pdf in the hope that it will prove to be useful. Click on the image below to download the pdf.