How about double-clicking a cell to add or remove a tick-mark?
Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As
Boolean)
Const WS_RANGE As String = "H1:H10" '<=== change to suit
If Not Intersect(Target, Me.Range(WS_RANGE)) Is Nothing Then
With Target
If .Value = "a" Then
.Value = ""
Else
.Value = "a"
End If
.Font.Name = "Marlett"
End With
End If
End Sub
'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.
--
HTH
Bob Phillips
(replace somewhere in email address with gmail if mailing direct)