Here's the whole project:
Springs came without holes:

Bought new 1/8" bit for hardened steel. Clamped down spring on drill press. Drill at a low speed with some oil constantly dripped to keep cool and lubricated. Takes time, but pretty easy.

You'll need a 3/8" washer and 1/8" cotter pin, to lock in post.

You can't just slide it in the sleeve though.

I used a ladder to hold up the lid to take pressure off large bolt holding main upright. Took the bolt out and lifted center tent post, so I could slide the spring in the lower hole and upper sleeve.

It took a little twisting and maneuvering to get the hole lined up with the bolt again. Then put the bolt/nut back together.

Slide on the washer and bent the cotter pin into position.

No worries. Easy project.
-sc