First things first - the metal on a model engine is NOT that soft!

It can and does take a LOT of abuse without breaking!

Unless you have dropped this engine from a great height this should NOT have happened![:@]

You have a defineate defect from the manufacturer! Send it back for replacement!!

IF they will not replace it you need to go to the local hardware store and buy a package of J&B Weld - a high temp Metal Epoxy - you'll figure out how to mold it to fit easily enough.