You will probably need to tap the top of the valve stem to get the core to present its threaded end. You may need to use a knife point to pull it out ...
Step 2: Remove the nut
Use a pair of pliers to remove the nut from the thin threaded visible portion of the valve. The threads may have been crimped a little to prevent the nut coming off accidentally. Save the nut because you will be putting it back onto this thin stud.
Bio:I miss the days when magazines like Popular Mechanics had all sorts of DIY projects for making and repairing just about everything. I am enjoying posting things I have learned and done since I got my...read more »