Here is my first go at using the new hollow center pin.
I used the indoor lathe (drill and Dremel) to grind down a 14g hypo needle so it just slips through the pin. I wanted some sticking out the top (but probably not that much, I will probably trim it), then I was thinking I would drill out the atty center pin a little so the protruding needle stuck up into the atty center pin just a bit to eliminate as much contact with the brass as possible.
This seems to work ok so far except the tube doesn't fit extremely tight around the 14g needle.
So I might make something completely different

.....but I wanted to try something that most could replicate.
BTW if you didn't notice, I also used a cut down original FD510 with the guts from a new FD510 and the longer/hollow center pin.
I know the pics are huge.....sorry