leejeansct Store How to Use Your Erector Beginners Set & Models Made with Young Builders Insert ITEM: How to Use Your Erector Beginners Set & Models Made with Young Builders Insert. A.C. Gilbert, Co. 2 sided. Measures 19" by 20" unfolded. Great diagrams of some of the things that can be built from these vintage sets.CONDITION: Insert is in very good condition. Some edge and fold wear. TERMS: Winning buyder adds $4.00 s/h Please seeour other eCRATER productlistings and our eCRATER Store for more great items. We will combine shipping for multiple product wins if possible.