converting a file from binary to plain text

[neologist]

How do I switch a file checked in (whether on purpose or
inadvertently) from binary to plain text?

I found this discussion, but it doesn't seem to be working as
expected:

http://groups.google.com/group/gnu.cvs.help/browse_thread/thread/8d0d83414831ae69/58e9af497a696e79?lnk=gst&q=binary+to+text#58e9af497a696e79

We have a file that is not evaluating the keywords upon
successive commits. I supposed that the problem must be that
it was inadvertently admined or otherwise committed somewhere
along the line with -kb.

I could simply delete and re-add it, but it's up to version 1.41,
and my objective is to retain the log history.

I experimented by making a copy of the original and adding it
like this:

$ cp fc.tex fc-delete.tex
$ cvs add fc-delete.tex
cvs add: scheduling file `fc-delete.tex' for addition
cvs add: use `cvs commit' to add this file permanently
$ cvs commit -m "test file" fc-delete.tex
/cvs/emp-man/fc-delete.tex,v  <--  fc-delete.tex
initial revision: 1.1

The keyword strings are properly evaluated. So far so good. Then
I switch the file to binary like this:

$ cvs admin -kb fc-delete
RCS file: /cvs/emp-man/fc-delete.tex,v
done

I edit the file, then:

$ cvs commit -m "edited to add a line after declaring it binary" fc-
delete.tex
/cvs/emp-man/fc-delete.tex,v  <--  fc-delete.tex
new revision: 1.2; previous revision: 1.1

The keyword strings remain unchanged, also correct. Next, I do:

$ cvs admin -kkv fc-delete.tex
RCS file: /cvs/emp-man/fc-delete.tex,v

I add another line to the file, followed by:

$ cvs commit -m "another change"  fc-delete.tex
/cvs/emp-man/fc-delete.tex,v  <--  fc-delete.tex
new revision: 1.3; previous revision: 1.2

However, the keywords are still unchanged. I see this:

$ cvs status fc.tex
===================================================================
File: fc.tex            Status: Up-to-date

   Working revision:    1.41
   Repository revision: 1.41    /cvs/man/fc.tex,v
   Commit Identifier:   6MFma3kbG0Ikrdlt
   Sticky Tag:          (none)
   Sticky Date:         (none)
   Sticky Options:      -kb

It appears that cvs admin -kkv did not really change the binary
mode. What can I do?

Thank you.