HI I am new to the site my name is Dave. I have a tissot watch that I have had for over 30 years. It has been serviced several times. The last time I sent it in I was told I was told parts are no longer available. I decided to work on it myself. The problem I have is the oscillator rotor bearing looks like a press fit no bearing nut has anyone ever seen this type of setup. Is the bearing replaceable? The rotor is a tissot part and the movement is 7750. Any help would be great. Thank you.