Has anybody heard of a unit called snail?
Good catch on the factor of 12.
I'd only add a clarification that I consider the definition of a snail to be:
1 lbf*sec^2/in, where lbf is a pound-force. I always avoid using the unit abbreviation lb, as it is ambiguous and could be used to represent a pound-force (lbf) or a pound-mass (lbm).
And just for fun, I'd like to propose a new unit, that will likely never need to be used by anyone for any practical analysis. I call it the whorl.
The narrow mouthed Whorl snail is only about the size of a grain of sand:
Narrow Mouthed Whorl Snail.