My Alden Super Deluxe Zig Zag SUZ-2 has two plastic cam stacks as well as some other control parts in there. Beautiful sewing machine, quiet, smooth, sews wonderful stitches, weighs a ton, but that plastic turns me off. I wouldn't have bought it had I known about the plastic pieces.
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Cam stacks run parallel to the main shaft;
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One of the cams is chipped. Can you tell which one?
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I have put some Tri-Flow grease on these cams. Just to help the steel follower follow the contours.
Joe