-> Dennis has proposed a wire wheel on a drill or grinder.   I tried a
-> wire wheel on my variable speed drill and it worked.  But it also
-> removed some of that natural texture looks of concrete ... but it is
-> still functional ... just not as eye appealing to me.
I thought that the texture was essential to the function of concrete
perches.  Seems like concrete worn smooth wouldn't work to file the
nails down.  The idea of handing the perches over to Charlie and his
beloved power tools is MOST appealing, though.  Let me know how it works
for you.
                                                         TTYL, Jan
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