I didn't revert them; I trimmed them significantly and in doing so made it rather incorrect.
I think this should work.

@@ -16 +16 @@
-<gloss>counter for sheets of paper and nori</gloss>
+<gloss>counter for units of paper and nori (48 pages of Mino paper; 20 pages of hanshi; 10 sheets of nori)</gloss>

"You use this one to count piles or bundles of thin things, like paper and nori seaweed sheets. This one is tricky, though—the actual number depends on what is being counted. For example, if you're counting 海苔 (のり), nori seaweed, 一帖 means ten sheets. If you're counting 半紙 (はんし), traditional writing paper, 一帖 means twenty sheets. And, if you're counting 美濃紙 (みのがみ), which is 半紙 made in the Mino region (美濃/みの), 一帖 means forty-eight sheets!

Counts: photo albums, notebooks, sets of ten nori seaweed sheets, Japanese manuscript paper, folding screens, sets of twenty hanshi sheets, sets of forty-eight minogami sheets"
https://www.tofugu.com/japanese/japanese-counters-list/

Jim reverted some changes I feel are important to keep, namely how much his counter counts depending on the object.

I do want to discuss this further but that discussion probably belongs on the mailing list, so I'll approve this for now.

I really didn't think this through when I replied to Marcus, but on reflection I think I agree with Robin that having an explicit mention of "counter for" in the glosses is the best way to go. 
I did a quick count and of the approx. 118 entries with "ctr" as a PoS, 94 have the word "counter" in them, so it's pretty much the default style.
I'm proposing to put back the way it was, with minor changes.

@@ -16 +16 @@
-<gloss>unit of paper and nori (48 pages of Mino paper; 20 pages of hanshi; 10 sheets of nori)</gloss>
+<gloss>counter for sheets of paper and nori</gloss>
@@ -20 +20 @@
-<gloss>folding book, folding screen, shield, etc.</gloss>
+<gloss>counter for folding books, folding screens, shields, etc.</gloss>
@@ -24 +24 @@
-<gloss>pair (of curtains)</gloss>
+<gloss>counter for pairs (of curtains)</gloss>
@@ -29 +29 @@
-<gloss>tatami mat</gloss>
+<gloss>counter for tatami mats</gloss>

I feel quite strongly that "counter for" should stay. Many people don't pay attention to the PoS labels and won't notice that the counter senses are actually counters, especially on websites/apps that don't clearly divide the senses by part of speech (WWWJDIC, for instance).
I think it's better to be explicit.