The piston came out too far for the tool to fit. You either have to get a skinnier tool, modify your tool or try and turn the piston in far enough so
your tool will fit, using a pair of channel lock pliers.
- Grab the edge of the piston with the channel lock pliers and turn the piston 1/2 to 1 turn counterclockwise.
- Use the channel lock pliers and push the piston in (will only move a little)
- Grab the piston at the edge again and turn it again