The long-stem Frigidaire knobs (5304525746 / 5304504839) are a common cracked-collar failure. A printed knob lets you set the bore depth and wall thickness yourself.
Shaft fit: 6mm D-shaft with a longer stem reach — set the bore depth to match. Knobulator lets you set the exact bore
shape and clearance, so the knob grips the shaft instead of spinning — the usual failure of
one-size-fits-all replacements.