[OthercarisaFiat]

Step 2: Put the top end of the pipe over the bolt head and washers (these will keep it in place) and maneuver the bottom end over the spring retainer. Rotate the pipe so that the window is accessible, preferably up to catch any dropped keepers.

Step 3: Make sure the pipe is centered over the spring retainer, and adjust the nut on the hook to take up any slack, then press down on the handle to compress the valve. Hold it with one hand and use your other hand to remove or insert the keepers, with needlenose pliers, hemostat or whatever. By twisting and manipulating the handle, you can control the position of the retainer with respect to the valve stem to facilitate getting the keepers in and out.