Help! Monolith turntable platter removal

Thanks everyone. I used the methods described above and it worked. 

Take off the mat. There are holes/slots on each side of the platter. Put a couple of fingers in each hole, then push down on the spindle with your thumbs while pulling up on the platter:

https://www.youtube.com/watch?v=6cwJIZG1Gps&t=63s

Wedge the platter upward to the end of its travel and then gently tap the spindle with a hard cover book or a tack hammer. Operative word is “gently”.

Some platters do bear threaded holes which facilitate their removal.

I would do what member “noromance” recommended.  You could layer up the cardboard and cut to fit the plinth.  Someone should design a platter puller, similar to what one would use to remove a steering wheel.  

You could try tapping in wooden/plastic shims while prying upwards using the holes in the platter. Try hitting the spindle with a wood block and mallet to loosen.

Alternatively, gently pack cardboard under platter and leave it on while moving.