[Yosemite Sam]

The bolt holes in Cub Cadet Original frames had a tendancy to crack where they bolt to the gear reduction housing. They aren't very hard to repair, depending on the crack, you can weld it back up or make a doubler plate and weld it in there. The sucky part (as you already know) is that PO,s would drill holes in the cast iron reduction housing to "repair" the frame. Cast iron doesnt "fix" as easy as steel, You can put some masking tape over the hole on the outside and put some JB weld in the hole from the inside... The masking tape will give the filler a look that is similar to texture of the cast iron.