I was reading the other thread about benchtop mortisers, and the discussion of adding an x-y table caught my eye. How do you fit one on a mortiser without losing all your clearance under the bit. I did my due diligence and searched on youtube and google, but didn't find any actual guidance on how to do this. I have a Delta 14-651. Looking at the HF table. The riser for this mortiser only adds 1 3/4" - is that enough?