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How to adjust the straight stitch on a Bernina 117 zigzag sewing machine.

I use a dial indicator mounted on a flexible arm magnetic base to adjust the straight stitch on a zigzag Bernina 117. I was getting a slight zigzag while the machine was set to straight stitch. A dial indicator is a basic measuring tool that has a plunger on one end. As the plunger moves in and out of the indicator, a needle on the dial shows the measurement of the distance. Each line on this dial indicates .001 of an inch (one thousandth of inch = .0254mm). After mounting the indicator on to the flexible arm I set the plunger against the block that holds the needle bar, depressing it until I get a reading on the dial. I then zero the dial by rotating the face. As the needle bar moves back and forth it depresses the plunger causing the needle on the dial to move. Using a 5mm screwdriver I loosen the limit stop and slide it to the center of the shaft. Then I turn the zigzag lever to maximum zigzag to get access to the adjustment screw. Then I loosen the screw with a 2mm screwdriver and then move the zigzag lever VERY SLIGHTLY, then tighten screw and move the zigzag lever back to straight stitch. Rotate the hand wheel and watch the dial indicator if the needle moves more than it did when I started I readjust moving the zigzag lever in opposite direction after loosing the adjustment screw. I repeat this adjustment procedure several times until there is very little movement of the needle on the dial indicator. I was able get the movement down to less than one thousandth of an inch. Then I readjust the limit stop so that the zigzag lever can move between straight stitch and full zigzag.