Swift BST - Bump Spring Stacker

Introducing the correct way to stack a bump spring. Our bump spring stackers allow you to create any combination of rate using our flat wire bump springs. Comes with an adjustable lock nut giving you the ability to lock out the lower bump spring at the compression of your choosing allowing for a fully customizable true dual rate bump spring setup.

• 1/2", 14mm, & 5/8" Bushings Included
• Bump Springs and retainer sold separately
• Eliminate spring rubbers
• Build Progressive & Digressive stacks
• 1/16" load adjustment