Step 5Modify Ribba Frame
Disassemble the Ribba frame and liberate the square spacer that separates the glass from the back by about an 1". It's got to be cut in half for the iron filings to get close enough to be properly affected by the magnetic pen.
Take the spacer over to the table saw and cut it in half, so that you end up with two 1/2" thick squares.
**The first three pictures below show the dis-assembly of a small white Ribba frame, but, rest assured, the process is exactly the same with the big 19" one.**
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All in all, doing it that way might actually even be easier than cutting the spacer in half on the table saw since it's such a thin cut and the material is so delicate.