I’m not sure how long it took to collect them because they’re mostly leftovers from various auctions I won.
Since they were used a lot, I kept them for daily use.
Otherwise, the leadholders that I bought unused or almost unused, I keep in my collection and don’t use them. I have NOS pieces of all these pieces, of course and more. I will share them sometimes.
For sharpening I use a standard (non-vintage) Staedtler 502, where you can choose a long and short tip. I like the long one also.
EDIT: For Pan-Technico I use vintage sharpener Staedtler 505: 771 & 773 & 775 & 777… it is not 3096 only - #5 by majkycz_y