Original 14mm cover sheets will NOT fit into thinner cases. It’s not possible without folding the sheets, which will stretch/tear the clear overwrap, or or cutting the sheets. So if you’re not gonna reprint your covers, you might as well forget it.
I started using 9mm cases from CompUSA about 4 years ago, but when they went out of business, I couldn’t find that size again. I got a load of 7mm, but they’re just [B]TOO[/B] thin to read anything on the spine. Fortunately, a couple of places now carry 9s, so I just got a box from Meritline. (153-319-100 $21)
I quit counting when I had ~1300 titles, so I guess I’m near 1500 now, and it DOES make a difference. So do the bulk cases (like 8 & 10 with ~27mm spines) for big collections that come in separate 14mm cases. There are 14mm cases that will hold up to 6 disks. I keep a variety on-hand.
I scan my original cover sheets, shrink ONLY the spine, then save both versions. I store the original, print the slimmed version, & cut it to fit on a Fiskars paper cutting board.
If you want a sample of cases just to try the sizes, I’ll sell you one or 2 of each. E-mail me thru my profile.