Re: The subject is a 74 20 cc with some problems
The proper backup washer or backing block can only be determined by the comperssion strength of the core material and the thickness of the fiberglass. Some of the most common errors made by people are the use of square washers and round washers that are too small. No matter what size you use, make sure that some type of bedding compound is used. This is most important with square backing plates as the corners have a habit of cutting into the laminate and causing faliures over the long term.
Bill
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