Quoth Chuck:
  I just had a thought about another possible
alternative for write-
 protect tabs.
 How about the foil tape used in the construction trades, such as 3M
 425?  I seem to recall that the adhesive on this stuff is pretty
 heavy-bodied and should stick well, but be easy to remove. 
You could also use book tape if it's a mechanical sense system.
Very heavy, quite sticky plastic.