Another thing to watch out for is the two halves of
some if not all
 were screwed together with self tapping screws. When you take
 them apart bit of plastic may come out of the holes or fall off the
 insides of the screw threads. That plastic if gets between the platter
 and head will not be to the heads advantage. 
I seem to recall that one of the RK05 manuals warned that when re-fitting
said screws you should always put them in, turn them anticlockwise
until the threads engage and then tighten them clockwise. Just
screwing them in not only risks (as ever) stripping the thread in the
plastic housing, but also the action of cutting the new thread may
cause bits of plastic to break loose and they might (will!) end up
where they shouldn't
-tony