I haven't tried them, but I'm sure somebody has. From scrounging around the interwebs, the main benefit is less force on the seal, which helps prevent "galling" the post threads. It sounds like they'd work fine on the posts, but the up-charge may not be worthwhile if you replace after every kicked corny.
With that being said, where are you finding #111 quad seals for $3? Please share!
Originally Posted by DustBow
For $3 I figured why not & threw a bag in the order.
They're currently $11.54 (100-count bag) at McMaster-Carr.