Is your mast deck or keel stepped?
You need to insert something soft, like closed cell foam to avoid a hard spot. Even though the deck is 100% firm, it still flexes and you don't want a hard spot holding it up and stressing the glass.
You need to insert something soft, like closed cell foam to avoid a hard spot. Even though the deck is 100% firm, it still flexes and you don't want a hard spot holding it up and stressing the glass.