This is a 3D printable Spanner Wrench to allow easy replacement of worn seals on most, but not all, Lezyne pumps. Print this part, and install two 12.5 gauge finish nails. Home Depot: https://www.homedepot.com/p/Grip-Rite-12-1-2-x-2-1-2-in-8-Penny-Bright-Steel-Nails-1-lb-Pack-8F1/202308477 Lowes: https://www.lowes.com/pd/Fas-n-Tite-1-lb-12-5-Gauge-2-5-in-Hot-Dipped-Galvanized-Finish-Nail/1000098208 Heat the nails with a soldering iron to get the heads flush. Trim the protruding part of the nails to about 1/4" (≈6mm), and the tool is ready to use.