Protractors save a lot of pride.

Check it first, unless you enjoy throwing money away like my ex-wife's lawyer.

Read somewhere that good design is a silent salesman. Makes sense to me.

You guys are still debating bottle ridges? The cold is the whole point. It's not about the bottle shape, it's about the temperature shock making everything tight. A frozen can of soda works the same way.

That stethoscope trick is solid. My buddy had the same thing with a GE unit, windings perfect but it sounded like a bag of marbles inside.