After years of using the normal single catch havaheart traps my father switched to a Squirrelinator multi catch trap. IT IS AMAZING. Some days he will catch 4 squirrels in the trap several times. It seems that after you catch one the others get jealous and they all run in. Pellet gun from a few meters away takes care of them after that.
That looks pretty cool...thanks!
OP: My grandfather had the same issue with one of his cars. After replacing his third fuel line, he said F it and sold the car for a newer one.
You will never eliminate all the squirrels, and my grandfather has been trying for 50 years.