Yes. Normally, when I order hands from VTI, They are delivered with springs attached. I order them the way. Surprised you received separate parts.
You need to clamp the hand securely on a solid surface. DO NOT have the clamp on or near the little slot for the spring. It helps to file a tiny bevel on the off side of the spring. Align the spring with the slot and tap it in with a hammer. Alternate method is to use a machinist
vice, and after aligning the spring as above, close the face to drive the spring into the slot. Peen as necessary.
Coffinmaker