Cant get my decorative stiches to work? - Singer 5062 Mechanical Sewing Machine

SOURCE: I have a quantum cxl.

The needle shaft sticks to the curved arm and won't come down because a piece of plastic, about an eighth of an inch thick had broken from age. It prevented the shaft from staying up on the needle arm. Open the cover, try to stitch decorative stitch and see what I mean. Purchase a package of 4-10 by 1/2 nut and bolt pack. Screw the nut all the way onto the bolt. Using needle-nosed plyers, Carefully bend the curved arm slightly, and place bolt into the hole on the top of the needle shaft. Nut will keep it in place. Lowering the needle shaft using wheel, carefully bend arm back in place. Try decorative stitch. It should work. It does for me.