Very sorry to see your poor beat up E7. The stock belt is about the only weak area in an otherwise stellar design. If you run the stock belt, tension has to be 'just right', not to tight and not too loose. If you want to continue to run your ship as belt drive, I'd suggest getting the Mikado 600SE Kevlar belt. It's a 'drop in' fit and is less stretchy than the stock fiberglass belt and makes much less boom slap and is also a little less finicky regarding tension. Plus, IMO, it is stronger! Otherwise, I can heartily recommend rebuilding with the torque tube upgrade! I have around 200 flights on my E7 and probably 170 of them are on the torque tube and it just hums right along. No cold/hot weather adjustments and no worries.