Not exact matches
Use something with a small
tip to such as a mini
screwdriver to make a hole at the top
of each.
If you can place a flat
tip screwdriver on the
tip of the bolt and pry it back towards the nut, then hold the nut with your wrench (spanner), then turn the bolt counterclockwise while holding the
screwdriver tight, you may be able to get the bolt to nut interface to grab and then allow you to take the bolt out.
A basic check for a working injector can be done by listening to the injector with a mechanic's stethoscope or by holding the
tip of a long
screwdriver to the injector and placing your ear on the handle to listen for the distinctive clicks
of the injector opening and closing.