a. If you are developing a shiftless swing then a Full Plane Board.
b. If you are not developing a shiftless swing then a 1/2 Plane Board would be better suited.
The other option is to use a flash light or lasers with a line on the floor and wall...
Martee,
I have always been somewhat leery of using flashlights. Conceivably, you can make a flashlight shine at a line thru 180 degrees, right? Doesn't seem right to me...
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"Hi, I'm Troy McClure and you might remember me from such films as 'The Greatest Story Ever Hula-ed' and 'They Came to Burgle Carnegie Hall.'"