Using the PVC Nipple Extractors is easy. First, insert the extractor into the broken riser in the PVC fitting. Make sure it's properly seated. Then, grip the rubberized T - handle firmly and turn it counter - clockwise to remove the broken riser. When installing a new riser, simply reverse the process and turn the handle clockwise to tighten it.
As for precautions, always wear safety gloves to protect your hands. Also, ensure that the extractor is the correct size for the riser you're working with.
To keep your extractors in good shape, after each use, clean off any dirt or debris with a dry cloth. You can also apply a light coat of lubricant to the steel parts to prevent rusting. Store them in a dry place to avoid any damage.