I have an old delta contractor table. I recently tried to make some cabinet doors, when I noticed how off my cuts were. I found my blade was not square to the miter slots. I purchased one of those PALS kits and am able to get my blade square with the miter slot (checking with a dial indicator and homemade jig). After I retighten the bolts, I recheck the numbers. So far so good. After I made two or three cuts, I recheck the numbers, and the blade is out of square again. I have been messing with this thing for hours, can't figure it out. I appreciate any help I could get. Thanks.