6yeah of course, once you have extractd the plastic keys (be very careful as these break so easily around the hinge part). You then (remembering where the original grease was applied), after carefully wiping of the old. re apply the new grease to those parts of the key only and then re-insert. If memory serves me, I did an octave each go, But start on C3 and go up through the middle of the bed. The reson this is good to do is that you will find the most cracked keys! What I did was to use the other keys never played from the upper and lower parts of the bed, then the gap made is a reminder to either replace or simply place the duff ones in to fill the space. First time doing it I found maybe 5 keys at random places, (all different notes) I made a note of these and placed them into the extramities. Going forward, I used the note (then placed inside so when I re greased 6 months or so later, I added them to the list of keys to repurchase. I lost only about 2-3 the next time, so I suspect it is the lack of maint. that caused most to go but boy are they fragile. It may be possible to glue back any broken plates as I call them but one needs to cleverly de grease them first ... not easy. I bought new individual keys for a ebay. Best of luck with it matey. just need plenty of space and a cross head screwdriver, there are good tear downs on YT.
