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Import single specific delimited column from text file to a userform textbox

I have a text file that has alot of superfluous data in it that i need to pull specific data from using vba. The specific data is listed beneath the CALIBRATION DATA under the "Channel" heading. I only need the channel number and its following comma to be imported to a userform textbox. Additionally, I need there to be no spaces between the different numbers.
example: (2,3,5,7,8)

I have attached the text file I'm using.

Thanks for any help!
29.txt

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Rgonzo1971

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jcgroove

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Thanks! That worked really well. Here is the final product.

Private Sub CommandButton2_Click()
    Dim SelectedFile As String
    With Application.FileDialog(msoFileDialogFilePicker)
    .AllowMultiSelect = False
    .Title = "Select the text file"
    .ButtonName = "Confirm"
    .InitialFileName = "C:\"
    If .Show = -1 Then
    SelectedFile = .SelectedItems(1)
    Open SelectedFile For Input As #1
    ImportTextFile = Input$(LOF(1), 1)
    Close #1
    ImportTextFile = Mid(ImportTextFile, InStr(1, ImportTextFile, "= CALIBRATION DATA =") + 2)
    ImportTextFile = Mid(ImportTextFile, 1, InStr(1, ImportTextFile, vbCrLf & vbCrLf))
    aImportTextFile = Split(ImportTextFile, vbCrLf)
    For Each Item In aImportTextFile
        If Item Like "*#,*" Then
            Res = Res & WorksheetFunction.Clean(Split(Trim(Item), " ")(0))
        End If
    Next
    Else
    Unload Me
    End If
    End With
    TextBox1.Value = Res
    If Right(TextBox1, 1) = "," Then TextBox1 = Left(TextBox1, Len(TextBox1) - 1)
End Sub

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