correct, basically there are three size adjustments. both on back posts (largest) one on front post and one on back post on other side(middle) and both on front post (smallest)But, you don't use both bolts on each side, right? Mine came with the spring loop on the first bolt, the second bolt not in use. I removed the first bolt on one side of each fin and pushed the spring in to the second bolt to tighten the spring on my foot a tad bit, but I didn't try to force the first bolt back in through the spring, that wouldn't make any sense...right?