Upgrade your existing FlexFence Wire Rope Safety Barrier (WRSB) system to the MASH TL4 compliant MashFlex WRSB in a cost-efficient way with a simple upgrade kit. Existing runs of TL3 or TL4 Flexfence can be upgraded with the upgrade kit while reusing the existing cables, post footings and anchor blocks. The kit consists of a sleeve packer and stiffening insert, making the old post footing compliant. The standard MashFlex post and post-cap can then be installed into the old foundation. This offers a significant cost saving over replacing the entire below ground parts of the system.