Don't know enough about the differences between the two machines to reccomend whether or not to perform the Mortise Wedge procedure above, but, I do know that if you drill a 4 x 4 with the right dill bit size, then wedge cut the wood to the correct angle, the wedge can be clampled to the valley and used as a guide to pre-drill the Mortise. It will eliminate a pile of clisel cleanup work. Also, it will allow you to drill from both sides, so the Mortise would be crisp edged.
Hope this helps.
