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It press fits a little bit into the flywheel hole and thus covers over the hole to give a much better and neater appearance.
Made from quality brass and machined to a high standard this is a must for perfectionist Mamod enthusiasts.
Just one note of caution - you will need to cut a little bit off the crank shaft and then press fit and super-glue the insert in place.
Don't forget, this is for both the Traction Engine and the Showmans Engine.