I see that Woodpeckers has a new table saw surface ground steel alignment plate along with a stainless steel 90-degree triangle for table saw alignment costing $200.00. I know that other companies have similar plates for about half the cost. I was wondering whether a 10 inch diameter plate glass disc with a 5/8 diameter arbor hole would an inexpensive alternative. Also, would a 10-inch 3/8 thick diameter aluminum plate that is face turned on a lathe so that both surfaces are parallel on both sides accomplish aligning a table saw? Any answers or experience would be appreciated.