The F.W. Arms™ Dynamic Spring Hold Down add-on is for use with only the F.W. Arms™ style hold down found here: FW Arms™ Auto-Case Centering Static Hold Down. Use of the Dynamic Spring Hold Down add-on for any use other than detailed by F.W. Arms™ could cause bodily injury, and/or damage to your reloading equipment.
Use proper safety equipment at all times.
Step 1: Remove black upper cap from the F.W. Arms™ Static Hold Down. Do not throw cap away, you might need a static hold down at some point.
Step 2: Screw the F.W. Arms™ Dynamic Spring Hold Down add-on where the cap was. If needed, you can use a 3/8″ hex wrench to help screw the unit on. Do not over tighten unit onto hold down die. Hand tight is fine.