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Those diagonal lines are called Retrace Lines. They can be caused by two things 1.) driving the electron gun to the circuitry's limit (which is usually done with a weak CRT to make it look better), or 2.) blanking. Blanking is a circuit that feeds pulses from the vertical to the video amp/output or one of the elements of the electron gun...To prevent the gun from writing in the time it takes after the end of the last field for the beam to return to the start point...when the beam does write it creates retrace lines.
Re bottom of screen if you did a full recap, but did not touch the vert size/height and vert linearity controls then try those first...You want a test pattern with evenly spaced horizontal bars. Adjust the set with that pattern so that the space between bars on the sets is even and fills the screen...You may also want/need to adjust the centering rings while doing this.
As for the side being compressed look for horizontal size/lin controls and see if that helps...If minor it could be natural for this set. Some non-linearitys if minor can or should be swept (pun coincidental) under the rug....If the set has a lot of overscan, and the picture is not centered such that more of the bad side is shown changing the centering to move the non-linearity off the screen may be worth doing.
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