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Any good ideas? Part coming back "again" for repair of drill hole in wrong location. 1" to 2" diameter hole on a thin wall turbine shell 904 metal, location of hole is on a raised stepped boss on the outside and is drilled thru machined grooves on the inside. Person who repaired it first time no longer works here and nobody knows how it was repaired the 1st time. 410-15 filler with 400 degree preheat. Any ideas new employee?