Sony Super BETAMAX SL-330 VCR No Remote Black For Parts

Used, tested, was working originally but tape got stuck when I tried to eject it, so selling for parts!  Tape is still in the unit! When it was playing, the picture had signs of tearing/distortion at the bottom of the screen when cassette is played. From my knowledge, the likeliest reasons for this are either that the film is old and wearing out, or the video heads inside the unit are dirty and need to be cleaned, which can be done by removing the top and cleaning manually.  There are also imperfections on front panel, all shown in photos but described here:  1) the clock button and preset/fine tuning buttons feel stuck.  2) the sharpness tracking soft knob is badly chipped, making it inconvenient but not impossible to twist the knob