• Safe installation of the sealhead without damaging U-cups or O-rings
• Precision-sanded for 9 mm shock shafts (Float X2 / DHX2 2016–2020)
• Compatible with the MTB-Hydraulics Service Kit

Many 2016–2020 Float X2 and DHX2 shocks use a thin locknut that often snaps when removed. With the Fox U-cup seal (P/N 812-060-086), the sealhead must be installed from the piston side, which requires removing the piston and risks shaft damage.

This tool is sanded to exactly 9.00 mm and matches the profile of the official Fox 398-00-797 tool, allowing a smooth installation from the piston side.

If the locknut breaks (common), replace it with a standard 1/4-28 thin nut and use red Loctite. This avoids relying on the fragile shaft tip.

• Only required when installing the sealhead from the piston side
• Not usable from the eyelet side

If using the MTB-Hydraulics kit (O-ring instead of U-cup), you can install from the eyelet side with a 9 mm shaft clamp and a lot of SRAM Butter.

Not Fox’s official method, but extremely reliable in practice.

Apply Slickoleum, SRAM Butter, or Maxima Suspension Grease generously. The bullet tool fits tightly by design. Grease prevents sticking and protects seals during installation.

• Only compatible with 9 mm shock shafts (Float X2 / DHX2 2016–2020)
• Not compatible with 2021+ X2 or DHX2 models
• Made from plastic; less durable and slightly less smooth than the metal Fox 398-00-797

• How to Clamp Small Shafts
• Essential Tools for Any Rebuild
• MTB-Hydraulics Seal Kit