Only Cub Cadets

I have worked on mowers since I can remember. My family owned a Snapper and Stihl dealership until 2018. It was just my father and me left running it and after he passed in 2012 it became too much for me to do by myself. I sold the building to a Cub Cadet dealer and have stayed on now as only a tech. I have over 40 years experience but only around 5 with Cub. I not impressed with the later Cubs but the newer series are better but nowhere near the old Cubs. I have a 9 year old son who is wanting a project and since I no longer own a store I cant teach him the way I learned by working there. I figure an old Cub would be a good place to start.
Thanks for letting me on. If I can help with any of the stuff from Cub let me know. Cub still has a lot of information available.