Do you recommed to use another, a "thicker" gasket - or only grind it flat?

I tried to make a pic that shows backlight coming thru under my ruler... but it's not to good...

Outboarders will probably leak too, right?

6589398-170420111291.jpg (43 downloads)
After all these years having a 440 I realized that this means having an attitude... and a budget.