I had two visits from a tech who finally found out it was not the handle that needed replacing but the grill that the handle attaches to. The one hole on the grill was stripped and could not allow a full tightening of the handle
At this writing, the repairs will be completed this coming week. It was not a job I could do myself but required the expertise of a technician.
The saving factor in all of this matter was the quick and accurate response of your company in supplying the correct parts