The Polaris P-85 clutch is a great clutch but over time the weights can gouge in to the spider and cause damage. This durability kit consists of 6 stainless steel shims. The installer can choose to install one shim on the thrust side of each weight or file a small amount of material off the spider to create enough space to install on both sides of the weights. Without the shims we usually see substantial damage to the spider after only 2 seasons. The shims can also reduce bushing and roller wear as they will help keep the weights square with the rollers.