Final answer:
Pruning shears are not recommended for removing the face mask from a football helmet.
Step-by-step explanation:
The tool that is NOT recommended for removing the face mask from a football helmet is pruning shears. Pruning shears are designed for cutting branches and are not suitable for removing a face mask. The other tools listed, such as a PVC pipe cutter, FM extractor, and screwdriver, can be used for the specific task of removing a face mask from a football helmet.