Greetings from
Nebraska.
I store my bushings inside little plastic jars that fit neatly inside plastic boxes. The jars are 1.5 inches in diameter and are 2 inches tall. The box is 6.50 x 5.00 x 2.25 Inches and holds 12 jars. They were relatively inexpensive at only $6 per box from our local Walmart store. I found them in the arts & crafts / bead storage area of the store.
I keep a new, unused, set in the bottom of each bottle along with a set that gets used. The new set is used both as a reference for measuring as well as for a backup set when I decide the "work in process" set has worn down and needs to be replaced.
As you can see from the photos, I also color code my pen kit storage based on the type of kit it is, Parker Twist, Rollerball, Cross, Themed, Sierra, etc. It really helps to find the bushings for a particular kit rather quickly. It also helps that I keep the most frequently used bushings in the top box. I carry the color coding scheme through to the labels on my kit storage drawers and the 3-ring binder I use to organize the kit instructions and my notes.
In addition, I make small nicks in the bottom (the end that goes into the tube) of the bushings according to their order of use. In my scheme, the #1 bushing is for the tip/nib with the highest number (usually #4) for the cap/finial/cabochon end.
I took a few pictures to help give you an idea of what I am talking about. (Click on them to Zoom-In)
Dave
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