I've never heard it said that way until I saw it on an Adam Savage video today. First Order Retrieve-ability. I started along that basic path a couple years ago when I first did this shelf.
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This shelf is more open and less cluttered now.
Today I was watching along and he started to talk about reamers. My reamers were stored in plastic bags in bins. Over, under, fractional, and odd sizes. Most bought surplus or on Ebay. Those were in bins.....bins are bs.
I made this before I got to the part of the video on how he made his reamer holder......I went out and spent an hour on this.
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You might notice mine is a bit weird compared to his. For instance, the 1/8" section is 5 holes wide. That is because I have several half thou over/under reamers and .001 over/under. All the 1/16" step sizes I made 5 holes even if i don't currently have the half and .001" over/under sizes.
I keep an inventory of every size reamer I have in my phone. If I find a reamer surplus for $5 per lb or at the flea market I can tell if I need it. I will continue to watch for quality reamers in good condition and I might fill those empty spots at pennies on the dollar. I have enough room for a couple more sets on this block.
I have lots more reamers that don't need to "first order retrieveable". Odds and duplicates. Now i have dozens more reamers in easy reach with no searching through bins and baggies.
This is Adam's video.