Find some 1/4" rod that you can bend like shown below.
Chuck end A into the spindle. DO NOT RUN SPINDLE WITH THIS IN THE CHUCK.
lower the spindle so B is just off the waste board.
By hand rotate spindle and observe gap from rod to waste board.
It should be the same thru full circle. If not you need to tilt spindle accordingly to resolve.
This is true providing your waste board has been milled to match X and Y planes.
Spindle can be tilted forward or backward with X rail connection to Y plates.
Tilting right or left can be done at Z connection to carriage.
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