either end is OK just follow the angle of the spring asit looks under the follower. someonehere has a photo tutorial on how it should look I am gonna say the angle of the spring should point upwards towards the front of the follower...

study it alittle and common sense will prevail.. then push the follower with the spring under it up in the magazine tube as far as u canpush it then insert a nail or rod through the last hole in the side of the mag tube and it will lock that tension and springin place. then allu need to do is push up just the remianng spring and insert the floor plate.