Don't struggle trying to get the springs into the trampoline frame! this amazing "Upper Bounce" spring pull tool also known as T-Hook, will help you slide the springs easily into trampline frame when you install your jumping mat. FeaturesDon't struggle trying to get the springs ...Don't struggle trying to get the springs into the trampoline frame! this amazing "Upper Bounce" spring pull tool also known as T-Hook, will help you slide the springs easily into trampline frame when you install your jumping mat. FeaturesDon't struggle trying to get the springs into the trampoline frame! this amazing "Upper Bounce" spring pull tool also known as T-Hook, will help you slide the springs easily into trampline frame when you install your jumping mat.