Efter flere forsøg kom jeg frem til denne
Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
If Not Intersect(Range("A6:A15,C6:C15,E6:E15,G6:G15"), Target) Is Nothing Then
Set mRg = Target.Item(1)
mStr = mRg.Value
End If
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
Dim xRg As Range
On Error Resume Next
Set xRg = Intersect(Range("A6:A15,C6:C15,E6:E15,G6:G15,Q19"), Target)
If xRg Is Nothing Then Exit Sub
Target.Worksheet.Unprotect Password:=""
If xRg.Value <> mStr Then xRg.Locked = True
Target.Worksheet.Protect Password:=""
End Sub