i bought my pair of technics in oct 3rd, 2009 and ive been scratching heavily with them and was wondering how long they will last if i scratch with them for 6 hrs a day? because i noticed that the tonearm base is starting to move everytime i put a little pressure on it and the lock for the base height doesnt work anymore, like i can change the base height withought unlocking it does that mean its broken? also i read the manual and it says i should put new oil in it every 2000 hours of use? do i really have to and if i do where can i get one?