How do you whether or not you didn't swap ends and install it upside down?

How do you whether or not you didn't swap ends and install it upside down?

Perfect! I was wondering if it was REALLY possible. Thank you
spring in marked this side up.How do you whether or not you didn't swap ends and install it upside down?
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You’re full of it Dave.spring in marked this side up.![]()
You’re full of it Dave.
